VITAMIN B12 (CYANOCOBALAMIN)

Test Documentation
Specimen Required
Draw blood in a SST. Centrifuge, separate and send 1.0 mL serum (0.5 mL minimum) refrigerated in a screw-capped plastic vial.

Alternate Specimen
Plasma: EDTA
Serum: Red-top

Rejection Criteria
Grossly hemolyzed or grossly lipemic specimens, heparin plasma

Methodology
Chemiluminescence

Stability
Room temperature: Unacceptable; Refrigerated: 72 hours; Frozen: 3 months

Reference Range
211–911 pg/mL

Performed
Monday-Friday

Turnaround Time3 days
Test CodeB12
CPT-4 Code (s)
82607
LOINC Codes
35201-3

Warde
Medical
Laboratory