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Test Code HCYS Homocysteine, Serum

Performing Laboratory

Northwell Health Laboratories


Enzymatic Assay

Specimen Requirements

Container/Tube:  Gold-top tube(s).

Specimen: 2 mL of serum ( 0.5 mL min)

Transport Temperature:   Refrigerated.


Note: Spin down, remove serum from cells within 2 hours of draw

Reference Values

< 15.0  umol/L

Test Classification and CPT Coding


Day(s) and Time(s) Performed

Monday though Sunday

Computer Interface Code

PDM #  5900785

Useful For

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).