Magnesium 24 Hour Urine Test with Creatinine

Magnesium is a mineral essential for muscle function, energy production, and nerve signaling. A 24-hour urine magnesium test measures how much magnesium your body excretes, helping assess magnesium status and kidney function. Low urinary magnesium may indicate deficiency or malabsorption, while high levels could suggest excessive losses or dietary overload. This test is useful for evaluating muscle weakness, irregular heartbeat, and metabolic concerns.

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.