My doctor drew 6 vials of blood and
tested thyroid, enzymes, kidney, liver
, magnesium, creatinine CK, CBC, etc. Everything came back normal except the B12 = 148, where 200 is low. So, I've been on 2000mcg oral B12 supplements since Oct. 6, and we'll test the level again this Friday.
Meanwhile, I've been to GI to find cause of B12 deficiency. (I'm not a vegan, don't drink any alcohol, and am not anemic.) Endoscopy and colonoscopy were normal, and biopsies were negative for H. Pylori.