Diagnostic Testing Medical

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

Arbor Diagnostics