Serum - Gel

Whenever vitamin B12 is requested an Active-B12 (Holotranscobalamin) is performed. Measurement of the active (biologically available) form of vitamin B12 is the earliest known marker for identifying changes in vitamin B12 status. If a total serum vitamin B12 measurement is required see link below.

LAB NOTES Lithium Heparin CANNOT be used for testing

As required