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Vanderbilt Pathology Laboratory Services

Test Directory



VITAMIN B12 (B12)

Department: Chemistry
Test Synonym(s): B12
CPT Codes: 82607
Methodology: Competitive Binding Immunoenzymatic Assay
Reference Range: 0 to 150 yrs: 213-816 pg/mL
Tube Type: Red Top Tube - 5mL
Specimen: Submit red top tube. Do not centrifuge.
Alternate Specimen: None
Pediatric Requirements: 1 microtainer
Minimum Volume: 0.7 mL serum
Temperature: Room Temperature or Refrigerated.
Stability: Unseparated serum: Room temperature or refrigerated (2 - 8 C) up to 24 hours;Separated Serum: Room temperature up to 3 days; Refrigerated (2-8 C): up to 7 days
Reasons for Rejection: Improper collection; QNS
Days Performed: Daily
Times Performed: Continuous
Special Instructions: Effective 1/20/2014, the acceptable tube type for Vitamin B12 Testing is Red Top tube.
This is due to an artifact identified in the green/mint top tubes that caused occasional spuriously high results.

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