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Vitamin B12
(a.k.a B12)
minimum sample volume required ~ 5ml
Test Code: B12
Tube type: SST
Other acceptable tube types
Lithium heparin (pale green)
Special instructions
None
Reference Range
No reference range is quoted, please refer to level specific comments on reports, in summary:
<100 ng/L: likely deficiency
100 - 145 ng/L: possible deficiency
145 - 200 ng/L: may still indicate deficiency in a small proportion
>200 ng/L: deficiency not likely to be present
>914 ng/L: raised serum vitamin B12
Time limit for add on
48 hours post collection.
Minimum retesting interval
Test should not be repeated within 42 days
Units
ng/L
Linked to
Haematinics
Turnaround Time
2
days
Department: Biochemistry
Clinical Application
NOTE: Change in method from 10/01/2023, this has a negative bias compared to the previous method.
Serum vitamin B12 levels do not measure vitamin B12 function, for which additional testing may be indicated.
