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1 Radioisotope and Medical Service, Boston veterans Administration Hospital,
and the Departments of Medicine, Boston University School of Medicine and Tufts University School of Medicine, Boston, Massachusetts.
1. Factors relating to the urinary excretion test for oral vitamin B12 absorption
were studied. A modified procedure is presented giving a high percentage of
urinary recovery of radioactivity in the normal. 2. Values in the pernicious anemia range were found in the presence of acute
infection and severe renal insufficiency. Other limitations in the interpretation
of the test are discussed.
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