PEDIATRICS Vol. 51 No. 2 February 1973, pp. 254-259
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THE FEP (FREE ERYTHROCYTE PORPHYRINS) TEST: A SCREENING MICROMETHOD FOR LEAD POISONING

Sergio Piomelli M.D.1, Bernard Davidow Ph.D.1, Vincent F. Guinee M.D.1, Patricia Young B.S.1, and Giselle Gay B.S.1

1 Department of Pediatrics, New York University Medical Center and The New York City Department of Health, Bureau of Laboratories and Bureau of Lead Poisoning Control

The FEP test is a micromethod that measures rapidly and reliably free erythrocyte porphyrins in a blood sample of 20µl. The results of the FEP test increase exponentially with the blood Pb level.

The FEP test was performed in 1,038 blood specimens submitted to the New York City Department of Health Bureau of Laboratories for Pb analysis. Of these, 568 had Pb levels ge 40µg/100 ml. The concentration of FEP was higher than 250µg/100 ml RBC (positive FEP test) in all the samples with greatly increased blood Pb level (ge 60µg/100 ml), in 55.1% of those with ambiguous blood Pb level (40 to 59µg/100 ml), and in 5.1% of those with low Pb level (< 40µg/100 ml).

The FEP test provides a biological indicator of undue lead absorption, suitable for rapid screening of children for lead poisoning. The test can easily be performed by any clinical laboratory.

Submitted on July 20, 1972
Accepted on August 29, 1972


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