R U H Bath, return to home page

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

  back to assay index

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 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


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.


back to top