Abstract
Fluorescence microscopy tests were carried out in different groups of patients Peripheral blood diluted with saline was used and 200 high power fields were inspected in every case. The results were presented as the number of fluorescing erythrocytes (FE) per 100000 red blood cells (or 200 fields). In the controls, porphyria cutanea tarda patients and patients with photodermatoses other than erythopoietic protoporphyria and pellagra almost no FE were detected. In erythropoietic protoporphyria the mean value was 10600, in lead poisoning 1032, in patients exposed to lead 48.2, in sideropenic anaemia 123 and in patients with pellagra 8.1 FE/100000 red blood cells. The conclusion is made that one has to take care, when using this test for detection of latent carriers in genetic studies of the relatives of patients with erythropoietic protoporphyria. The test is useful for the confirmation of the diagnosis of erythropoietic protoporphyria.
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