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Test Name:Homocysteine
Epic Order Code:LAB93
CPT Code:83090  
Specimen(s) Type:Serum; 1.0 mL
Acceptable Container(s):Tops are gold and red.
Testing Schedule:Monday-Friday
Turn Around Time:STAT: NA
 Routine: 1-3 days
Collection Information:No special patient preparation is required. Obtain specimen by standard collection procedures.
Transport Information:Deliver to lab immediately on ice. All specimens must be signed into the laboratory.
Reference Clients:If unable to deliver to the lab immediately on ice, centrifuge the specimen and remove serum from the red cells. Store and transport at 2-8° C. Specimen must be received in the lab within 14 days. If longer storage is required, store and transport the sample at -20° C for up to 1 year.
Causes for Rejection:Improperly labeled, incorrect container, contaminated, insufficient quantity, incorrect/delay in transport, gross hemolysis.
Reference Range:Male: 5.46 - 16.20 µmol/L
 Female: 4.44 - 13.56 µmol/L
Additional Information:The following drugs may elevate levels of homocysteine: methotrexate, carbamazepine, phenytoin, nitrous oxide, anticonvulsants and 6-azauridine triacetate. The mechanism of action of these drugs affects different parts of the metabolic pathway of homocysteine.