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Labcorp Oklahoma, Inc.
Test Directory


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Vitamin B12

Order Name VIT B 12
Test Number: 4500900
Revision Date 06/04/2021
Test Name Methodology LOINC Code
Vitamin B12
Chemiluminescence Assay 2132-9 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.5 mL) Serum Clot Activator SST Refrigerated
Alternate 1 1 mL (0.5 mL) Plasma Lithium Heparin PST (Light Green Top) Refrigerated
Instructions Allow serum to clot fully, then separate serum and plasma within 2 hours of collection.
Unacceptable: hemolyzed serum or plasma. 
Specimen stability: Ambient 3 days, Refrigerated 7 days, Frozen 1 month
GENERAL INFORMATION
Testing Schedule Daily 
Expected TAT 1-3 days  
Clinical Use Useful in the investigation of macrocytic anemia and work-up of deficiencies seen in megaloblastic anemias. Also used for diagnosis and investigation of some neurological disorders. 
CPT Code(s) 82607
Lab Section Chemistry