UW Hospital and Clinics Lab Test Directory
| Test Name: |
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Vitamin B12
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| Test Code(s): |
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B12
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| CPT Code(s): |
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82607
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| Methodology: |
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Chemiluminescent Immunoassay
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| Days Performed: |
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Daily.
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| Turnaround Time: |
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Stat: Not available stat.
Routine: 4 hours.
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Specimen Requirements
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| Specimen: |
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Blood
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| Collection Container: |
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Preferred: Red cap with yellow ring (SST)
Also Acceptable:
Green cap with yellow ring (PST),
Green top,
Lavender top,
Red top
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| Collection Volume: |
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Preferred: 1 mL
Pediatrics: 0.7 mL
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| Sample Analyzed: |
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Serum or plasma
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| Volume Required: |
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Preferred: 0.5 mL
Pediatrics: 0.25 mL
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| Specimen Processing: |
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Centrifuge blood within 2 hours. Transfer cell-free plasma/serum to plastic vial. Refrigerate. If transport time exceeds 48 hours, freeze plasma/serum sample.
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| Specimen Transport: |
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Transport specimen to UWHC Core Laboratory (B4/220). Transport with coolant pack if coming from outreach location. Transport frozen specimen on dry ice.
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| Stability: |
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Ambient: 8 hours
Refrigerated: 48 hours
Frozen: okay
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Interpretation
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Reference Interval:
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0 days and up: 210-910 pg/mL
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B12, Vitamin
cobalamin
cyanocobalamin
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