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Erythropoietic protoporphyria. The problem of a suitable screening test
D J Todd1, G S Nesbitt, T D Lavery
1Department of Dermatology, Royal Victoria Hospital, Belfast, United Kingdom.
Acta Dermato-Venereologica
|January 1, 1990
Summary
Erythropoietic protoporphyria (EPP) diagnosis is often missed. Fluorescence microscopy of erythrocytes is a highly effective screening method for detecting increased red cell porphyrins, improving EPP detection rates.
Area of Science:
- Hematology
- Medical Diagnostics
Background:
- Erythropoietic protoporphyria (EPP) presents with photosensitivity.
- EPP is characterized by elevated red blood cell protoporphyrins.
- Traditional diagnostic methods for EPP have shown low sensitivity.
Purpose of the Study:
- To evaluate the diagnostic efficacy of fluorescence microscopy for EPP.
- To compare fluorescence microscopy with traditional screening tests for blood porphyrins.
Main Methods:
- Recalled 14 known EPP patients in Northern Ireland.
- Utilized fluorescence microscopy for erythrocyte porphyrin determination.
- Compared results with historical diagnostic data.
Main Results:
- Traditional solvent extraction missed 90% of EPP cases over 20 years.
- Fluorescence microscopy correctly identified all 14 EPP patients.
- No EPP cases were missed using fluorescence microscopy.
Conclusions:
- Fluorescence microscopy is a superior screening test for EPP.
- This method significantly improves the detection of increased red cell porphyrins.
- Recommends fluorescence microscopy as the preferred diagnostic tool for EPP.