Vanderbilt Pathology Laboratory Services
Test Directory
VITAMIN B12 (B12)
Department: ChemistryTest Synonym(s): B12
CPT Codes: 82607
Methodology: Competitive Binding Immunoenzymatic Assay
Reference Range: 180-1000 pg/mL
Tube Type: Light green PST (Lithium Heparin with gel) tube - 4.5 mL
Specimen: Plasma; Serum preferred
Alternate Specimen: Red top tube - 5 mL
Pediatric Requirements: 2 microtainers
Volume: 3 mL plasma
Minimum Volume: 0.7 mL plasma
Temperature: Separate within one hour and store at 2-8ºC until delivery
Stability: Room temperature up to 8 hrs; >8 hrs: refrigerate 2-8 degrees C up to 24 hrs; >24hrs: freeze at -20C
Reasons for Rejection: Hemolysis; improper collection; QNS
Days Performed: Daily
Times Performed: Continuous
Special Instructions: Protect from light
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