Homocysteine : 31789

Test Code

HMCYC or 31789

CPT Codes
83090

Preferred Specimen

1 mL serum

Minimum Volume

0.5 mL

Other Acceptable Specimens

Plasma in sodium heparin (green-top) or EDTA (lavender-top)

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 4 days
Refrigerated:14 days
Frozen: 6 months

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Gross hemolysis, Grossly lipemic, Unseparated serum or plasma, Whole blood specimens

Methodology
Immunoassay

Setup Schedule

Sunday - Saturday

Report Available

1 day

Reference Range

**Homocystine Reference Range, μmol/L**
AGE	Male	Female
0 to <2 yr	Not established	Not established
2 yr to <10 yr	≤7.6	≤7.6
10 yr to <15 yr	≤9.7	≤8.4
15 yr to <18 yr	≤11.3	≤10.2
18 yr to <30 yr	≤12.9	≤10.9
30 yr to <50 yr	≤13.5	≤11.0
50+ yr	≤15.2	≤13.4

Clinical Significance

An elevated concentration of homocysteine is an independent risk factor for cardiovascular disease. When used in conjunction with methylmalonic acid (MMA), these tests are useful to diagnose and monitor vitamin B12 (cobalamin) and folic acid deficiency and are often useful in evaluating macrocytosis (an elevated MCV, an erythrocytic index).

Performing Laboratory
med fusion

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.