Free erythrocyte porphyrins in the detection of undue absorption of Pb and of Fe deficiency

Abstract

A fluorometric assay for free erythrocyte porphyrins (FEP) is described in detail, the direct test being used for the analysis of blood specimens collected with anticoagulants and the spot test for analysis of blood specimens collected on filter paper. A method for determining the amount of blood absorbed by different lots of filter paper is described.