Test name: Homocysteine
Order Code: HCYS
Preferred Specimen: 2mL serum in a Serum Separator Tube (SST or Tiger-top)
CPT Code: 83090
Collection: Store blood specimen on ice immediately after collection until centrifugation. Allow SST to clot in an upright position for 30 min, then centrifuge sample within 1 hour of collection. Refrigerate. Hemolyzed or severly lipemic samples should not be used.
Special Instructions and Considerations: Patients who are taking methotrexate, carbamazepine, phenytoin, nitrous oxide, anticonvulsants, or 6-azuridine triacetate, may have higher levels of Homocysteine due to metabolic interference with homecysteine metabolism.
Transport Temperature: Refrigerated
Specimen Stability: 7 days under room temperature; 3 weeks refrigerated
Causes for Rejection: Hemolysis