| Synonyms:
| Vitamin B12, Cyanocobalamin |
| Specimen: | Blood; (1) SST (serum separator) or Red (no preservative) top vacutainer tube. |
| Volume: | Full primary tube |
| Minimum Volume: | 200 microL serum |
| Collection: | If tube other than an SST is collected, transfer serum to a tightly capped plastic aliquot tube within 2 hours of collection for transport.
Refrigerate at 2-8°C for 7 days. |
| Rejection Criteria: | Incorrect specimen type; improper labeling. |
| Reference Range: | 157-1059 pg/mL |
| Methodology: | Direct chemiluminescent technology |
| Test Use: | Clinical and laboratory findings for B12 deficiency include neurological abnormalities, decreased serum B12 levels, and increased excretion of methylmalonic acid. The impaired DNA synthesis associated with B12 deficiency causes macrocytic anemias. These |
| Additional Information: | Excessive exposure to light may alter vitamin B12 values. |
| Testing Includes: | |
| Testing Facility: | AnMed Laboratory |