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Pathology Departments Requesting & Reporting Blood Test Information Phlebotomy Guide Contact us
Blood Sciences

Blood Test Information

Vitamin B12
(a.k.a B12)
minimum sample volume required ~ 5ml

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Test Code: B12

Tube type: SST

Other acceptable tube types
Lithium heparin (pale green)

Special instructions

Reference Range
No reference range is quoted, please refer to level specific comments on reports, in summary:
<100: likely deficiency
100 - 180: possible deficiency
181 - 250: may still indicate deficiency
>250: deficiency not likely
>914: raised serum B12

Time limit for add on
48 hours post collection.

Minimum retesting interval
Test should not be repeated within 42 days


Linked to

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.


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