Vitamin B12

Methodology: 
Chemiluminescent immunometric assay
Performed: 
Monday - Friday
Reported: 
Within 3 days
Use: 
This test aids in detection of vitamin B12 deficiency in individuals with macrocytic/unexplained anemia, or unexplained neurologic disease.
Specimen Requirements: 

Collect blood by venipuncture into an SST/gold-top tube or alternatively a light-green/lithium heparin tube.

For serum, allow the specimens to clot at room temperature. Separate the serum/plasma from the cells, using a refrigerated centrifuge and avoid hemolysis. If possible, keep specimens cold (2 - 8°C).

Stability (collection to time of analysis/testing):
  • Refrigerated (2 - 8°C): 8 hours
  • Frozen (-20°C): 2 months
Reference Values: 
193 - 982 pg/mL
CPT Code (s): 
82607
Test Directory