The transcobalamin-vitamin B12 complex (Holotranscobalamin) contains the biologically active cobalamin. A decrease of Holotranscobalamin is one of the earliest markers of cobalamin deficiency.
Retrospective testing - Note Sample MUST be Serum.
•• Specimens may be stored on or off the clot for up to 16 hours at room temperature or up to 3 days at 2-8°C.If testing will be delayed more than 3 days, remove serum from the clot and store at -20°C or colder. Avoid more than 3 freeze/thaw cycles.
Reference for Retrospective Testing: Abbott Alinity Active-B12, kit insert March 2019
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