advanced cardiovascular health comprehensive

This test measures cholesterol levels in peritoneal dialysate fluid, the fluid used during peritoneal dialysis treatment for kidney disease. Cholesterol in dialysate can indicate peritoneal membrane problems or nutritional issues in dialysis patients. While not a standard screening test for cardiovascular risk, it provides information specific to dialysis adequacy and peritoneal membrane function. Elevated levels may suggest membrane changes or metabolic complications.

Sodium (Na+) is an essential electrolyte measured primarily in blood serum or plasma. It plays a critical role in fluid balance, nerve impulse transmission, and muscle contraction. Serum sodium is one of the most commonly ordered laboratory tests, included in both the Basic and Comprehensive Metabolic Panels. Abnormal levels indicate conditions ranging from dehydration and kidney disease to hormonal imbalances. Sodium can also be measured in urine (to evaluate renal sodium handling) and stool (to differentiate causes of diarrhea).

This test measures iron concentration in liver tissue, typically obtained through biopsy. Liver iron assessment is used to diagnose and monitor hemochromatosis (iron overload) and cirrhosis. Elevated liver iron indicates excessive iron accumulation, which damages the liver and other organs, causing fibrosis, cirrhosis, and increased disease risk. Iron measurement helps distinguish iron-related liver disease from other causes and guides chelation or phlebotomy treatment.

Eosinophils are a type of white blood cell involved in allergic and parasitic responses. This test examines sputum (phlegm coughed up from lungs) under a microscope to detect eosinophils. Elevated sputum eosinophils suggest eosinophilic airway inflammation, which may indicate asthma, eosinophilic bronchitis, parasitic infections, or allergic conditions. This test helps diagnose conditions causing chronic cough and guides treatment selection.

This test measures glucose concentration in peritoneal dialysate fluid, the solution used during peritoneal dialysis for kidney failure. Glucose naturally diffuses from the dialysate into the bloodstream during treatment, and measuring residual glucose helps assess dialysate dwell time and treatment effectiveness. Changes in dialysate glucose levels can indicate peritoneal membrane changes or absorption problems affecting dialysis adequacy and treatment outcomes.

Chloride is an electrolyte essential for fluid balance, nerve signaling, and muscle function. This test measures chloride in peritoneal fluid (fluid around abdominal organs), which helps evaluate conditions affecting the abdomen such as peritonitis, ascites, or organ dysfunction. Abnormal chloride levels in peritoneal fluid can indicate infection, inflammation, or metabolic disturbances requiring medical attention.

Potassium is a vital electrolyte that regulates heart rhythm, muscle function, and fluid balance. Blood potassium testing is one of the most commonly ordered laboratory tests, included in both the Basic and Comprehensive Metabolic Panels. Hypokalemia (low potassium) can result from diuretic use, vomiting, or diarrhea and may cause muscle weakness, cramps, and dangerous cardiac arrhythmias. Hyperkalemia (high potassium) may result from kidney disease, certain medications (ACE inhibitors, potassium-sparing diuretics), or tissue damage. Both extremes require prompt clinical intervention due to life-threatening cardiac risks.

Globulins are proteins produced by the immune system and liver that function in immunity and nutrient transport. When measured in body fluids, globulin levels help assess immune function and protein status in specific body compartments. Elevated globulins in fluids like cerebrospinal or peritoneal fluid may indicate infection, inflammation, or immune-related conditions, while low levels could suggest nutritional deficiency or immune suppression.

Basophils are immune cells that release histamine and other chemicals during allergic reactions and inflammation. This test measures basophil counts in synovial fluid (joint fluid), which helps diagnose joint inflammatory conditions like rheumatoid arthritis, gout, or septic arthritis. Elevated basophils in joint fluid indicate inflammation or immune response in the joint. Results guide diagnosis and treatment of joint disease.

Carbon dioxide (CO2) in blood, measured as bicarbonate, is crucial for acid-base balance and respiration. This test assesses how well your lungs remove CO2 and how well your kidneys regulate acid balance. Elevated CO2 suggests respiratory problems or metabolic alkalosis, while low CO2 may indicate hyperventilation or metabolic acidosis. Results help diagnose breathing disorders, kidney disease, and serious metabolic imbalances affecting multiple organ systems.

Albumin is a protein produced by the liver and normally found in very small amounts in body fluids like urine. Microalbumin testing detects trace levels of albumin in urine that aren't visible on standard tests. The presence of albumin in urine—called albuminuria—is an early warning sign of kidney damage. This can result from diabetes, high blood pressure, or other kidney disease. Regular albumin screening helps detect kidney problems before significant damage occurs, allowing for early intervention and management to slow or prevent progression.

Creatinine is a waste product produced by muscle metabolism and filtered by the kidneys into urine. This test measures creatinine in an 8-hour urine collection and reflects kidney filtration function. Creatinine levels help assess kidney health and are often used to calculate glomerular filtration rate (GFR), which indicates how well your kidneys filter waste. Low creatinine output may suggest reduced muscle mass or kidney disease, while the ratio of protein to creatinine helps assess kidney protein loss. This test is frequently ordered in patients with diabetes, high blood pressure, or known kidney disease.

Neutrophils are infection-fighting white blood cells. This test counts neutrophils in pleural fluid (fluid surrounding the lungs) to evaluate lung and pleural conditions. Elevated neutrophils in pleural fluid suggest infection, inflammation, or malignancy affecting the lungs or pleural lining. The test also notes that elevated neutrophils in prostatic secretions may indicate prostate inflammation or prostatitis. Analysis of pleural fluid composition, including neutrophil count, helps diagnose pneumonia with effusion, empyema (infected fluid), or other serious lung conditions requiring urgent treatment.

Bilirubin is a yellowish compound produced when your body breaks down old red blood cells. When measured in pericardial fluid (fluid around the heart), elevated bilirubin can indicate liver disease, hemolysis (breakdown of red blood cells), or bile duct obstruction. It can also reflect pericardial inflammation or infection. This specialized test helps diagnose serious cardiac and metabolic conditions affecting the tissue surrounding your heart.

White blood cells (WBCs or leukocytes) are immune cells that fight infections and protect your body. This test measures WBC count in synovial fluid (fluid surrounding joints). Elevated WBC in joint fluid suggests infection, inflammation, or autoimmune disease affecting that joint. Very high counts may indicate septic arthritis (bacterial infection), while moderate elevation could indicate rheumatoid arthritis or other inflammatory joint conditions. This specialized test helps diagnose the cause of joint pain or swelling.

Platelets are small blood cells essential for blood clotting and preventing excessive bleeding. This blood test counts the number of platelets circulating in your bloodstream. Low platelet counts (thrombocytopenia) increase bleeding risk, while high counts (thrombocytosis) may indicate clotting risks or underlying disease. Platelet counts are affected by bone marrow disorders, medications, infections, and autoimmune diseases. This is a routine test included in complete blood counts to assess clotting function and overall blood health.

Monocytes are large white blood cells that help fight infections and clear damaged tissue. This specialized test counts monocytes in pericardial fluid (fluid around the heart). Elevated monocyte counts in pericardial fluid may indicate pericarditis (inflammation of the heart lining), infection, or autoimmune disease affecting the heart. This test helps diagnose serious cardiac conditions and inflammatory states. Results are interpreted alongside other fluid analysis tests for comprehensive cardiac assessment.

This test detects antibodies against myeloperoxidase (MPO), an enzyme in certain white blood cells. Elevated MPO antibodies are associated with ANCA-associated vasculitis, a serious autoimmune disease that causes inflammation of blood vessels. MPO-ANCA is one form of this condition. Positive results help diagnose vasculitis and guide treatment with immunosuppressive therapies. This test is particularly important for patients with unexplained kidney disease, lung problems, or multi-system inflammation.

Red blood cells (erythrocytes) are the oxygen-carrying cells in your blood. This automated test counts the number of red blood cells in synovial fluid (joint fluid), which is abnormal since red blood cells should not be present in joints. Elevated RBC counts in joint fluid may indicate joint injury, bleeding into the joint, or traumatic arthrocentesis (needle puncture during fluid collection). This result helps differentiate between inflammatory and non-inflammatory joint conditions.

Calcium is an essential mineral critical for bone health, muscle function, nerve signaling, and blood clotting. This test measures calcium levels in serum or plasma, reflecting overall calcium balance in the body. About 99% of calcium is stored in bones, while the remaining 1% circulates in the blood and is tightly regulated. Abnormal serum calcium may indicate parathyroid disorders, vitamin D deficiency, kidney disease, or certain malignancies. Both hypocalcemia (low calcium) and hypercalcemia (high calcium) can cause serious symptoms including muscle cramps, cardiac arrhythmias, and neurological changes.

Alkaline phosphatase (ALP) is an enzyme found in bones, liver, and intestines. It plays a role in bone formation and bile production. This test measures ALP levels to assess bone metabolism and liver function. Elevated ALP can indicate bone disease (osteoporosis, fractures, or Paget's disease), liver disease, or bile duct obstruction. Low levels are less common but may suggest nutritional deficiencies or genetic conditions. ALP is often part of routine health screening or organ function assessment.

Fibrinogen is a protein produced by the liver that plays a critical role in blood clotting. When you bleed, fibrinogen is converted into fibrin, which forms the mesh that stops bleeding. A fibrinogen test measures the amount of this clotting protein in your blood. Abnormally low levels may indicate bleeding disorders or liver disease, while elevated levels can increase clot formation risk and are associated with cardiovascular disease, stroke, and inflammation.

Urea nitrogen in urine reflects protein metabolism and kidney function. This test, typically performed on 12-hour or 24-hour urine collections, measures how much nitrogen from protein breakdown is excreted daily. Abnormal levels can indicate dietary protein intake changes, kidney disease, liver dysfunction, or metabolic disorders. The test helps assess protein metabolism, evaluate kidney function, and monitor nutritional status in patients with various metabolic or renal conditions.

Homocysteine is an amino acid produced during protein metabolism. Elevated blood homocysteine, called hyperhomocysteinemia, is an independent risk factor for cardiovascular disease, stroke, and blood clots. High levels may indicate deficiencies in vitamins B12, B6, or folate, kidney disease, or genetic factors affecting homocysteine metabolism. This test helps identify cardiovascular risk and vitamin deficiencies. Lowering homocysteine through B-vitamin supplementation or dietary changes may reduce heart disease and stroke risk.

Lipoprotein(a), or Lp(a), is a cholesterol-carrying particle with a genetic component that significantly influences cardiovascular risk. This test measures Lp(a) as a percentage of total lipoprotein, providing insight into your atherogenic lipid profile. High Lp(a) levels are an independent risk factor for heart attack and stroke, even in people with otherwise normal cholesterol. Unlike other lipids, Lp(a) is largely determined by genetics and is less responsive to diet and exercise, making it important for personalized heart disease risk assessment.

B-type natriuretic peptide (BNP) is a hormone released by heart chambers when they stretch from increased pressure or fluid overload. Blood BNP levels are a key marker of heart stress and fluid balance. Elevated BNP strongly suggests heart failure, even before symptoms appear, and helps doctors assess disease severity and treatment response. The test is also useful for distinguishing heart-related causes of shortness of breath from lung problems. BNP is one of the most sensitive tests for detecting heart dysfunction and guides treatment decisions in cardiovascular patients.

Aspartate aminotransferase (AST) is an enzyme found primarily in liver and muscle cells. When cells are damaged, AST leaks into the bloodstream where it can be measured. Elevated AST suggests liver damage from hepatitis, cirrhosis, fatty liver disease, or alcohol use, but can also reflect muscle injury from trauma, intense exercise, or heart attack. AST is typically ordered alongside other liver enzymes (ALT, alkaline phosphatase) to assess liver function. Moderate elevations may be temporary and benign, but persistent elevation requires investigation to identify the underlying cause.

Mean sphered cell volume measures the average size of red blood cells when treated under standardized laboratory conditions. This specialized test provides information about red blood cell shape and hydration status, helping diagnose hemolytic anemias and hereditary conditions affecting RBC structure like spherocytosis. Abnormal values suggest specific types of anemia or blood disorders requiring further investigation and targeted treatment.

Hemoglobin is the iron-containing protein in red blood cells that carries oxygen throughout your body. A hemoglobin test measures the total amount of hemoglobin in blood, revealing whether you have anemia (too little) or polycythemia (too much). Low hemoglobin causes fatigue, shortness of breath, and weakness, while high levels can increase clot risk. This is one of the most common tests in clinical medicine and a core part of the complete blood count.

HDL-2 is a specific subtype of 'good' cholesterol that is particularly protective against heart disease. This specialized test uses ultracentrifugation to isolate and measure HDL-2 cholesterol specifically. Higher HDL-2 levels are associated with better cardiovascular health and lower risk of heart attack and stroke. While standard cholesterol panels measure total HDL, this advanced test provides more detailed information about HDL quality, helping clinicians assess detailed cardiovascular risk in patients with metabolic concerns or significant family histories of heart disease.

A descreased ratio of eiscospentaenoate/arachidonate is a well recognized predictor of cardiovascular disease.[PMID: 24976364]

Alanine aminotransferase (ALT) is an enzyme found primarily in liver cells that leaks into the bloodstream when liver tissue is damaged or inflamed. This blood test measures ALT levels to assess liver health and detect conditions like hepatitis, fatty liver disease, cirrhosis, or medication-related liver injury. Elevated ALT typically indicates liver damage or disease, while normal levels suggest the liver is functioning properly. ALT is often part of routine health screening and is essential for monitoring patients taking medications known to affect the liver.

This test detects IgE antibodies against brewer's yeast proteins, indicating a potential yeast allergy. Brewer's yeast is used in fermented foods and beverages including beer, wine, and some breads. A positive result suggests you may experience allergic symptoms—ranging from mild itching or hives to gastrointestinal symptoms—after consuming yeast-containing foods. This test helps identify yeast as an allergy trigger, useful for those with suspected yeast sensitivity.

This advanced test measures the proportion of cholesterol carried by HDL 3c, a specific subtype of HDL (good cholesterol). HDL particles vary in size and density; larger HDL particles are considered more protective against heart disease. By analyzing the cholesterol distribution within HDL subclasses, this test provides detailed insight into the quality of your HDL, which may offer a more nuanced picture of cardiovascular risk than standard HDL testing alone.

C-reactive protein (CRP) is an acute-phase protein produced by the liver in response to inflammation. Measured in serum or plasma, CRP is one of the most widely used markers of systemic inflammation. It rises rapidly (within hours) in response to bacterial infections, autoimmune flares, tissue injury, and malignancy. High-sensitivity CRP (hs-CRP) at lower levels is used for cardiovascular risk stratification. CRP is valuable for monitoring treatment response in rheumatologic conditions, infections, and post-surgical recovery. Unlike ESR, CRP responds quickly to changes in inflammatory status.

This test identifies specific mutations in the EGFR (epidermal growth factor receptor) gene from blood or tissue samples. EGFR mutations are commonly found in certain lung cancers and can determine which targeted therapies will be most effective. Different mutations respond differently to specific medications called EGFR inhibitors. Testing for EGFR mutations is crucial for cancer patients to guide treatment selection, predict drug response, and optimize outcomes. This genetic information helps oncologists personalize cancer treatment plans.

This urine test measures the ratio of albumin to globulin proteins. Albumin is normally filtered minimally by healthy kidneys, while globulin appears in urine in very small amounts. An elevated albumin-to-globulin ratio in urine may indicate early kidney damage or diabetes-related kidney disease. Proteinuria (excess urinary protein) is an early warning sign of kidney dysfunction and cardiovascular risk. Monitoring this ratio helps track kidney health and response to treatment for diabetes or hypertension.

The erythrocyte sedimentation rate (ESR) measures how quickly red blood cells settle in a test tube over one hour. This simple test reflects inflammation levels in your body. Elevated ESR can indicate infections, autoimmune diseases, inflammatory conditions, or certain cancers. Low ESR is less common but may occur with blood disorders. ESR is often used alongside other tests to diagnose or monitor chronic inflammatory conditions, though it's not specific to any single disease.

Nucleated red blood cells (nRBCs) are immature RBCs that normally exit the bone marrow and mature before circulating in your blood. The presence of nucleated RBCs in peripheral blood is abnormal and suggests bone marrow stress or disease. This can indicate severe anemia, leukemia, infection, hemolysis, or other serious conditions. Finding nucleated RBCs on a blood smear typically warrants further investigation to identify the underlying cause.

Insulin is a hormone produced by the pancreas that regulates blood glucose levels by allowing cells to absorb sugar for energy. An insulin test measures circulating insulin levels, which rise after eating or during fasting depending on metabolic function. Elevated fasting insulin may indicate insulin resistance, where cells don't respond properly to insulin, increasing risk for prediabetes and metabolic syndrome. Low insulin levels may suggest pancreatic dysfunction or diabetes.

This specialized blood gas measurement indicates the partial pressure of oxygen (pO2) at which hemoglobin reaches 50% saturation—a value that reflects hemoglobin's oxygen-carrying efficiency. This adjusted measurement helps assess how readily hemoglobin releases oxygen to tissues. Abnormal values may indicate lung disease, heart conditions, altitude-related changes, or hemoglobin abnormalities. This test is primarily used in clinical settings for respiratory and critical care assessment.

This test measures the proportion of cholesterol in HDL 3a particles relative to total HDL cholesterol. HDL subfractions—including the smaller HDL 3a particles—have different cardiovascular protective effects. HDL 3a particles are generally smaller and less cardioprotective than larger HDL 2 particles. This ratio provides insight into HDL quality and particle composition, which may offer additional cardiovascular risk assessment beyond traditional HDL cholesterol levels.

percentile (of population)

Medium-sized beta lipoprotein subparticles are components of LDL (low-density lipoprotein) cholesterol. Advanced lipid tests measure the size and number of these particles, providing more detailed information than standard cholesterol tests. Increased levels of small, dense LDL particles are associated with greater cardiovascular risk, as these particles more easily penetrate artery walls. This test helps identify individuals at higher heart disease risk despite normal total cholesterol levels.

Thyroid stimulating hormone (TSH) is produced by the pituitary gland and regulates thyroid hormone production. A TSH test is the primary screening tool for thyroid disorders. Elevated TSH suggests an underactive thyroid (hypothyroidism), while low TSH may indicate an overactive thyroid (hyperthyroidism). Thyroid function affects metabolism, energy, weight, and mood. This is one of the most frequently ordered tests because thyroid dysfunction is common and affects overall health.

This test measures the ratio of omega-6 to omega-3 fatty acids in your blood—both essential fats crucial for health. The ratio reflects your dietary balance: excessive omega-6 relative to omega-3 may promote inflammation, while a lower ratio is generally considered healthier. Modern diets often contain too much omega-6 (from vegetable oils, processed foods) and too little omega-3 (from fish, flaxseed). Optimizing this ratio supports heart, brain, and joint health.

This test measures small, dense LDL cholesterol particles, a subset of low-density lipoprotein. Small, dense LDL particles are more atherogenic (damage-prone) than larger LDL particles and penetrate artery walls more easily, increasing cardiovascular risk. Elevated small dense LDL is associated with metabolic syndrome, insulin resistance, low HDL, and elevated triglycerides. This test provides more detailed cardiovascular risk assessment than standard LDL measurement alone, particularly useful for individuals with metabolic risk factors or family history of heart disease.

Band form neutrophils (bands) are immature white blood cells released from the bone marrow into the bloodstream in response to acute infection or inflammation. An elevated band count, known as a "left shift," is a hallmark of bacterial infection and sepsis. Bands are counted as part of the manual differential on a complete blood count (CBC). Their presence signals the body's urgent demand for neutrophils and is one of the SIRS criteria used in critical care. Monitoring band counts helps track infection severity and response to antibiotic therapy.

Lymphocytes are a type of white blood cell crucial for the adaptive immune response, including B cells (which produce antibodies), T cells (which coordinate and carry out cell-mediated immunity), and NK cells (natural killer cells). This blood test counts lymphocytes as part of the complete blood count with differential. Elevated lymphocyte counts (lymphocytosis) may suggest viral infections, certain leukemias, or autoimmune conditions. Low lymphocyte counts (lymphopenia) can indicate immunodeficiency, bone marrow disorders, or the effects of immunosuppressive therapies.

Non-HDL cholesterol represents all cholesterol particles except beneficial HDL cholesterol, including LDL and other atherogenic particles that contribute to plaque buildup in arteries. Unlike total cholesterol, non-HDL is considered a better predictor of cardiovascular risk because it measures the 'bad' cholesterol more accurately. Elevated non-HDL cholesterol increases risk of heart attack and stroke, particularly in people with high triglycerides or metabolic syndrome. Managing non-HDL through diet, exercise, and sometimes medication is important for heart health.

Iron binding capacity measures the amount of iron that can be carried by transferrin, a protein in blood that transports iron throughout the body. This test is part of iron metabolism assessment and helps evaluate iron stores and absorption. Elevated iron binding capacity may suggest iron deficiency, while low levels can indicate iron overload or chronic disease. Understanding iron binding capacity alongside other iron markers (ferritin, serum iron) provides a complete picture of iron status, which is essential for energy production, oxygen transport, and immune function.

Myelocytes are immature white blood cells normally found in bone marrow. Their presence in body fluids such as blood, pleural fluid, or peritoneal fluid is abnormal and may indicate serious conditions. Myelocytes in body fluids can suggest leukemia, severe infection, or other hematologic disorders. The number and type of myelocytes detected helps establish a diagnosis. This test is typically ordered when other findings suggest a blood cell disorder and requires interpretation alongside other cell counts and clinical findings.

EGFR (epidermal growth factor receptor) is a gene that, when mutated, can drive certain lung cancers and other malignancies. This test analyzes blood or tissue samples for specific EGFR mutations. Detecting these mutations is critical for patients with non-small cell lung cancer because it determines eligibility for targeted therapy drugs (like erlotinib or gefitinib) that specifically block the mutated EGFR protein. These targeted treatments are often more effective and better tolerated than traditional chemotherapy. This is a molecular diagnostic test that informs personalized cancer treatment strategies.

Blasts are immature blood or bone marrow cells. Finding them in body fluids (blood, joint fluid, pleural fluid, etc.) is abnormal and concerning. In healthy individuals, blasts should not appear in body fluids—they should remain in bone marrow and blood. Their presence may indicate leukemia, other blood cancers, or malignant invasion into body cavities. This is a quantitative test that counts the number of blasts, which helps assess disease severity. Further testing and specialist evaluation are essential if blasts are detected.

Cystatin C is a protein produced by all cells in your body at a relatively constant rate and filtered by the kidneys into urine. Measuring urine cystatin C levels helps assess kidney filtration function. Unlike creatinine, cystatin C is less affected by muscle mass and certain medications, making it a valuable marker for detecting early kidney disease or monitoring kidney function changes. This test is often used alongside other kidney markers to provide a more complete picture of kidney health.

Promyelocytes are immature white blood cells normally found in bone marrow, not in body fluids like blood or joint fluid. Detecting promyelocytes in body fluids is abnormal and may indicate serious conditions such as leukemia, particularly acute promyelocytic leukemia (APL), or leukostasis. The presence and quantity of promyelocytes helps diagnose blood cancers and assess disease severity. This finding requires urgent further investigation and specialist consultation.

Remnant lipoproteins are cholesterol-rich particles that remain after triglycerides are removed from dietary particles in the bloodstream. Elevated remnant lipoprotein levels indicate impaired cholesterol metabolism and are associated with increased cardiovascular risk, independent of traditional cholesterol levels. High remnant lipoproteins suggest metabolic dysfunction, poor diet quality, or genetic predisposition. This test provides insight into heart disease risk beyond standard lipid panels and may warrant lifestyle changes or medication.

This test calculates the ratio between LDL cholesterol (the 'bad' kind that builds up in arteries) and HDL cholesterol (the 'good' kind that protects your heart). Rather than looking at each individually, this ratio provides a comprehensive picture of your cardiovascular risk. A lower ratio is healthier, indicating better heart protection. This metric is often considered more predictive of heart disease risk than LDL or HDL levels alone, making it valuable for assessing overall cardiovascular health.

Lipoprotein midband B is an uncommon lipoprotein particle detected through specialized lipid testing. Its presence or elevation can indicate certain metabolic disorders or dyslipidemia patterns not visible on standard cholesterol panels. This test is typically ordered when routine lipid results are abnormal or when a patient has unusual cardiovascular risk factors despite normal standard cholesterol levels. Results help refine cardiovascular risk assessment and guide specialized lipid-lowering therapy if needed.

Metamyelocytes are immature white blood cells found in bone marrow that normally do not appear in significant numbers in body fluids. Their presence in blood, joint fluid, or other body compartments is abnormal and may indicate leukemia, severe infection, or a bone marrow disorder. This test counts metamyelocytes as part of a differential analysis in body fluid samples. Elevated levels suggest the bone marrow is releasing immature cells prematurely, which warrants further investigation.

CLSI (formerly NCCLS) document "Reference Leukocyte Differential Count (Proportional) and Evaluation of Instrumental Methods", 1992, recommend the use of variant lymphocytes rather than atypical or reactive lymphocytes.

This test measures the amount of cholesterol carried specifically by LDL (low-density lipoprotein) particles, the 'bad' cholesterol that can accumulate in artery walls. Unlike standard LDL tests, this advanced method directly measures LDL cholesterol separately from other similar particles, providing a more accurate assessment. Elevated LDL cholesterol is a key risk factor for heart disease and stroke. This test helps guide treatment decisions and monitor the effectiveness of cholesterol-lowering therapies.

Linoleate is an omega-6 polyunsaturated fatty acid essential for brain function, hormone production, and cell structure. Your body cannot produce it, so you must obtain it from foods like vegetable oils, nuts, and seeds. Blood linoleate levels reflect your intake and nutritional status. While omega-6 fatty acids are essential, high ratios compared to omega-3 fatty acids may promote inflammation. This test helps assess fatty acid balance and nutritional adequacy, particularly for those monitoring inflammatory conditions.

Docosahexaenoate (DHA) is an omega-3 polyunsaturated fatty acid crucial for brain health, eye function, and reducing inflammation. Your body produces small amounts from plant sources, but most comes from fish and seafood or supplements. Blood DHA levels reflect your intake and omega-3 status. Low DHA is associated with cognitive decline, depression, and increased cardiovascular risk. This test is particularly useful for monitoring supplementation, assessing cardiovascular risk, or investigating cognitive or mood concerns.

Eicosapentaenoate (EPA) is an omega-3 polyunsaturated fatty acid that reduces inflammation, supports heart and brain health, and helps regulate mood and immune function. Like DHA, EPA primarily comes from fatty fish, seafood, and supplements. Blood EPA levels reflect your dietary intake and omega-3 status. Higher EPA is associated with better cardiovascular health and lower depression risk. This test monitors omega-3 supplementation effectiveness and assesses inflammation and cardiovascular risk.

Omega-3 fatty acids are essential polyunsaturated fats that reduce inflammation, support heart and brain health, and regulate immune function. Your body cannot produce them, so they must come from dietary sources like fatty fish, flaxseed, and walnuts, or supplements. Blood omega-3 levels reflect your dietary intake and nutritional status. Higher omega-3 levels are associated with better cardiovascular health, lower depression risk, and reduced inflammation. This test assesses overall omega-3 status and guides supplementation decisions.

Omega-6 fatty acids are essential polyunsaturated fats found in oils, nuts, and seeds that your body needs but cannot produce on its own. This test measures the levels of omega-6 in your blood. While omega-6 is necessary for brain function and skin health, an imbalanced ratio of omega-6 to omega-3 fatty acids may promote inflammation. Most Western diets are high in omega-6, potentially contributing to chronic inflammatory conditions. This test helps assess your fatty acid balance and dietary patterns.

LDL cholesterol particles vary in size, and particle size pattern affects cardiovascular risk. Large, buoyant LDL particles are less atherogenic (less damaging to arteries), while small, dense LDL particles are more atherogenic. This test identifies your predominant LDL particle size pattern, providing insight beyond standard cholesterol measurements. A predominance of small, dense LDL particles is associated with higher cardiovascular risk, even with normal total LDL cholesterol. This test helps refine risk assessment and guide targeted interventions.

Total number of LDL particles (LDL-P) in namomoles per liter (1 nmol/L=6x10(14) particles/L)

Apolipoprotein B (ApoB) is the main protein component of LDL cholesterol particles and other atherogenic lipoproteins. Unlike standard cholesterol testing, ApoB directly counts the number of atherogenic particles in your blood, providing a more accurate cardiovascular risk assessment. One ApoB protein sits on each particle regardless of size, making ApoB a superior predictor of heart attack and stroke risk. This test is increasingly recommended for better cardiovascular risk stratification, particularly in people with metabolic syndrome or family history of early heart disease.

CD19 is a marker found on B lymphocytes, white blood cells that produce antibodies and fight infections. A CD19 cell count measures the number of B cells in your blood or bone marrow. Abnormally low CD19 counts may indicate immunodeficiency, leukemia, or complications from certain medications or treatments. Elevated counts can suggest chronic lymphocytic leukemia or other lymphoproliferative disorders. This test is particularly useful in diagnosing blood cancers and immune disorders.

This test detects IgE antibodies against egg white allergens in your blood. Egg allergy is common in children but can persist into adulthood. Reactions range from oral itching and hives to gastrointestinal symptoms and anaphylaxis in severe cases. A positive test confirms egg allergy and guides dietary avoidance of eggs and egg-containing products. Note that some individuals can tolerate cooked eggs (where proteins are altered) even if they react to raw eggs, so reactions may vary by food form.

Band neutrophils are immature white blood cells released from bone marrow during stress or infection. This test measures the percentage of band neutrophils relative to total white blood cells. Elevated bands (a left shift) typically indicate acute infection, inflammation, or leukemia. Normal blood contains mostly mature segmented neutrophils; a high proportion of bands suggests the bone marrow is urgently releasing immature cells to fight infection.

Hemoglobin A1c measures the percentage of hemoglobin (in red blood cells) that has glucose attached to it. Since red blood cells live about 3 months, HbA1c reflects your average blood glucose over the past 2-3 months. Unlike a single fasting glucose test, HbA1c provides a comprehensive picture of long-term glucose control. It's the gold standard for diagnosing and monitoring diabetes, and elevated levels indicate prediabetes or diabetes.

This test calculates the ratio of blood urea nitrogen (BUN) to creatinine, both waste products filtered by the kidneys. The ratio helps distinguish different causes of abnormal kidney function. A high ratio may suggest dehydration, excessive protein breakdown, or reduced kidney blood flow, while a low ratio can indicate liver disease or malnutrition. This ratio is more informative than either value alone in determining kidney dysfunction patterns.

This test measures total 25-hydroxyvitamin D, combining both vitamin D2 (from foods and supplements) and vitamin D3 (from sun exposure and food). The 25-hydroxy form is the best indicator of overall vitamin D status because it reflects total body stores. This single measurement efficiently assesses vitamin D adequacy for bone health, immune function, and calcium regulation without measuring multiple vitamin D forms.

GFR measures how efficiently your kidneys filter waste from blood, expressed as milliliters of filtrate per minute. It's calculated using creatinine levels adjusted for age, sex, and body size. GFR is the most accurate indicator of kidney function, with different stages indicating mild, moderate, or severe kidney disease. Even small declines in GFR can signal progressive kidney disease requiring monitoring and lifestyle modifications to slow progression.

Platelets are cell fragments essential for blood clotting and stopping bleeding. This test counts platelets in blood, with the Rees-Ecker method being a manual counting technique. Normal platelet counts range from 150,000 to 400,000 per microliter. Low platelet counts (thrombocytopenia) increase bleeding risk, while high counts (thrombocytosis) increase clot risk. Abnormal counts may indicate bone marrow disorders, autoimmune disease, infections, or medication effects.