See also: Vitamin deficiencies
Clinical features of VitB12 deficiency
History to accompany Vit B12 lab requisitions
Deficiency may be defined as a level less than 244 pg/L (180 pmol/L)
Replacement may be accomplished by daily PO doses of 1,000 mcg for 10 days then weekly for four weeks, then monthly for life.
On average, oral B12 is as effective as IM injection at achieving neurologic and hematologic response. Try it first.
B12 is available OTC as 100 mcg, 500 mcg, 1000 mcg, 5000 mcg tablets.