Pernicious anemia with "normal" B12, MMA, and homocysteine

[genesurf]

ncbi.nlm.nih.gov/pubmed/205...

"Serum B(12) levels ranged from 267 to 447 pg/ml. Homocysteine and methylmalonic acid levels were normal. Testing for antibody to intrinsic factor was positive, consistent with pernicious anaemia. After treatment with intramuscular B(12) injections (1000 μg daily for 1 week, weekly for 6 weeks, then monthly), she made a remarkable clinical recovery"