Homocystine

ChemistryAlso known as: Homocysteine, oxidizedAlso known as: Cystine-homocysteineumol/L

Measures homocystine (oxidized homocysteine) in plasma.

Normal Range
Consult your provider
umol/L
Abnormal Levels
Consult your provider
Specimen Type
Blood

Why This Biomarker Matters

Elevated homocystine indicates cardiovascular risk and metabolic disorders. This test identifies treatable conditions and guides B-vitamin supplementation to reduce heart disease risk.

Overview

Homocystine is the oxidized dimer form of homocysteine, an amino acid involved in protein metabolism. This plasma-only test measures homocystine to assess cardiovascular risk and screen for homocysteine metabolism disorders. Elevated levels indicate increased risk for blood clots, heart disease, and stroke, and may reflect deficiencies in vitamins B12, B6, or folate, or genetic metabolic disorders. This test helps identify cardiovascular risk and metabolic conditions treatable with B-vitamin supplementation or dietary changes.

Technical Information (LOINC Codes)

Standardized laboratory codes for this biomarker

27352-4Primary
Homocystine [Units/volume] in Serum or Plasma
[arb'U]/mL
38486-7
Homocystine [Presence] in DBS
22715-7
Homocystine [Moles/volume] in Specimen
umol/L
6884-1
Homocystine [Mass/time] in 24 hour Urine
mg/d
2431-5
Homocystine [Mass/volume] in Urine
ug/mL
25441-7
Homocystine [Moles/time] in 24 hour Urine
umol/(24.h)
2429-9
Homocystine [Presence] in Serum or Plasma
2430-7
Homocystine [Mass/volume] in Serum or Plasma
22660-5
Homocystine [Moles/volume] in Cerebral spinal fluid
umol/L
20646-6
Homocystine [Moles/volume] in Serum or Plasma
umol/L
26882-1
Homocystine [Moles/volume] in Amniotic fluid
umol/dL
26999-3
Homocystine [Moles/volume] in Urine
umol/L
14053-3
Homocystine [Presence] in Urine
54302-5
Homocystine [Moles/volume] in DBS
umol/L
55879-1
Homocystine [Moles/volume] in Body fluid
umol/L
13399-1
Homocystine [Mass/volume] in Amniotic fluid
13372-8
Homocystine [Mass/volume] in Cerebral spinal fluid
25928-3
Homocystine [Moles/volume] in 24 hour Urine
umol/L
26809-4
Homocystine [Presence] in 24 hour Urine

Available Lab Tests

Order tests that measure this biomarker

Amino Acids (Plasma) (36 biomarkers)

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