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Test Compendium


Test Code

  • 5210

Test Synonym

  • Homocysteine, Ultraquant


  • 2 mL

Minimum Volume

  • 1 mL

Specimen Requirements

  • Plasma / Serum


  • Transfer Tube - Plasma EDTA or Heparin. Also acceptable Transfer Tube Serum or SST


  • Refrigerated

CPT Codes

  • 83090
    *The CPT codes provided are based on AMA guidelines and are provided for informational purposes only. CPT coding is the responsibility of the billing entity. Please direct any questions regarding the CPT coding to the payer being billed.

Special Instructions

  • 2 mL Plasma from a Green Top (heparin) or Lavender Top EDTA) tube. Plasma (PREFERRED); serum is acceptable from red-top tube, or gel-barrier Causes for Rejection : Specimen received not separated from cells (do NOT respin a gel-barrier tube to harvest additional serum); gross hemolysis (eg, bright red or cherry red); whole blood tube; plasma from a light blue-top(sodium citrate) tube or yellow-top (ACD) tube used for coagulation studies(liquid citrate tubes have a dilutional effect of approximately 1.2 on this assay and are not approved for use); gross lipemia

Additional Information

  • Separate plasma or serum from cells immediately to avoid a false elevation of homocysteine. After one hour at room temperature, a 10% increase may be seen. Transfer plasma to a plastic transport tube - plasma preferred. Slightly higher values are observed in nonfasting patients. Homocysteine results increase by approximately 35% and 75% for samples not centrifuged and/or not separated from the clot for periods of four and 24 hours,respectively. Serum values are expected to be higher than plasma values.

Specimen Stability

  • AMBIENT: 14 days REFRIGERATED: 14 days FROZEN: 6 months