For the blocking antibody studies 7.5 mμg of labeled vitamin B 12 and 0.1 ml of intrinsic factor were used per test sample. All radioactive samples were counted in a Nuclear Chicago model No ...

H.B., a 72-year-old man, who had been a vegetarian since 1914, reported that he drank milk regularly and took an egg occasionally. In 1947 pernicious anemia was diagnosed at another hospital. He ...

Blood test to measure methylmalonic acid level — The blood level of methylmalonic acid increases when a person has B12 deficiency. Blood tests for intrinsic factor antibody — Your doctor may ...

had identified the presence of anti­intrinsic factor antibody and a markedly elevated serum gastrin level. At the three-month follow-up visit, the hemoglobin level was 11.3 gm/dL; MCV, 72 µm3 ...

Intrinsic factor antibody test, which can indicate if the body’s immune system is attacking the intrinsic factor protein needed for vitamin B12 absorption. Schilling test, ...

My antiparietal antibodies were abnormal, but the intrinsic factor antibodies were negative. I received daily B12 injections for six days, and now I’m on them once a month.