Pteroylglutamic acid nutrition in vitamin C-deficient guinea pigs.
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The blood concentrations of vitamin B12 and folate, which are very useful in diagnosis of megaloblastic anemia and of these factors' dificiencies, are actually measured by precise, rapid, and specific competitive binding radioassays. Futher clinical advantages can be reached with the application of other in vitro radioisotope techniques, such as radioassay of IF, of antibodies anti-IF, of transcobalamins, and of FABP (folic acid binding protein). The major impact of the vitamin B12, folates and other related radioassays has been to permit more Hospitals and laboratories to do these determinations, replacing the more time-consuming, relatively imprecise, and often artifactual microbiological assays.