Test Code B12 Vitamin B12
Specimen Type
Plasma
Container/Tube
Li-Heparin Mint Green Top
Offsite Collection Instructions
1. Collect sample following standard collection methods,
fasting
(8-14 hours) specimens is recommended.
2. Within 2 hours of collection the sample must be spun and
aliquoted
3. Transport refrigerated (2 – 8˚C).
Turnaround Time
4 hours
Test Includes
N/A
Preferred Volume
0.5 mL
UCMC Collection Instructions
1. Collect sample following standard collection methods,
fasting
(8-14 hours) specimens is recommended.
2. Within 2 hours of collection the sample must be received in
Laboratory Service Center
3. Transport room temperature (15 – 25˚C).
STAT Turnaround Time
N/A
Test Usage
Useful as an aid in the investigation of macrocytic anemia
and
workup of deficiencies seen in megaloblastic anemias.
Critical Results
N/A
Test Limitations
A normal serum concentration of vitamin B12 does not rule
out
tissue deficiency of vitamin B12. The most sensitive test for
vitamin B12 deficiency at the cellular level is the assay for
MMA.
If clinical symptoms suggest deficiency, measurement of
MMA and
homocysteine should be considered, even if serum vitamin B12
concentrations are normal.
Fee Code
30182607
Synonyms
Cyanocobalamin, B12
Stability: Room Temp
2 hours
Stability: Refrigerated
48 hours
Stability: Frozen
24 hours
Specimen Minimum Volume
0.2 mL
DAY(S) AND TIME(S) PERFORMED
24 hours, 7 days a week including holidays.
STAT DAY(S) AND TIME(S) PERFORMED
N/A
CPT
82607
Method Name
Electrochemiluminescence Immunoassay (ECLIA)
Reference Values
240 – 900 pg/mL
Reject Due To
Whole blood/unspun specimens greater than 6 hours will be
rejected.
Additional Information
N/A
Included in Additional codes
N/A
Coverage Information
N/A