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B12  (B12)

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.
Storage:  Refrigerate 2-8 °C.
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 Health Laboratory