Test Name: Homocysteine
Health Link Test Code: XHCYCD
LIS Test Code: HCY
CPT Code(s): 83090
Methodology: Chemiluminescent Immunoassay
Assist in diagnosis and treatment of patients suspected of having hyperhomocysteinemia and homocystinuria.
Days Performed: Daily, 24 hours.
In-Lab Turnaround Time: 4 hours.
Stat In-Lab Turnaround Time: Not available stat.
Collection Container: Lavender top
Immediately refrigerate blood tube or place on cold-pack after collection.
Collection Volume: 4 mL
Pediatric Collection Volume: 0.5 mL
6 hours on ice
Sample Analyzed: Plasma
Testing Volume: 1 mL
Pediatric Testing Volume: 0.25 mL
Centrifuge immediately and transfer cell-free plasma to plastic vial within 30 minutes of collection.
Transport specimen to the laboratory. Transport with coolant pack if coming from clinic location.
|2 months-10 years||
0.0 - 8.3
|11 - 15 years||
0.0 - 10.3
|16 - 17 years||
0.0 - 11.3
|18 years and up||
0.0 - 15.4
Interpretation Type: Reference Interval
S-adenosyl-methionine is an antidepressant whose molecular form is similar to S-adenosyl-homocysteine. Therapeutic levels of this drug may interfere with this assay.
Patients taking methotrexate, carbamazepine, phenytoin, nitrous oxide, anticonvulsants and 6-azauridine triacetate can falsely elevate HCY levels.
Results may be affected if patient has developed heterophillic antibodies due to exposure to animal based protein products.