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Test Number:
  • 0080380
Test Alias:
Preferred Specimen:
  • Serum
Container Type:
  • Plain Red Top
Alternative Specimen:
  • 2 mL
Collection Instructions:
  • Patient preparation: Overnight fasting is preferred. Patient should refrain from taking vitamin supplements or fruits 24 hours prior to sample collection.

    Collection instructions: Collect blood in a plain red-top tube. Allow to clot at room temperature (20-25° C) for 20-30 minutes. Centrifugation at 1000 g (2000-2200 rpm) and at 2-8° C for 8-10 min. Aliquot the serum into an amber polypropylene or polyethylene tube to protect sample from light. Alternatively, neutral color polypropylene or polyethylene tube wrapped in aluminum foil can be used. Neutral color tubes must be wrapped in aluminum foil. Cap securely. Serum must be prepared and stored in dry ice within 3 hours of sample collection. Do not thaw.

Transport Temperature:
  • Frozen
Specimen Stability:
  • Room temperature: Unacceptable
  • Refrigerated: Unacceptable
  • Frozen -20° C: See instructions
  • Frozen -70° C: 28 days
  • Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
CPT Code:
  • 82180
Reject Criteria:
  • Received thawed • Received room temperature • Received refrigerated • Received refrigerated and not protected from light
Reference Range:
  • 0.2-1.5 mg/dL
Report Available:
  • 9 days

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