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Related Experiment Videos

Performance of screening tests for porphyria.

A C Deacon1

  • 1Clinical Chemistry Department, Northwick Park Hospital, Harrow, Middlesex, UK.

Annals of Clinical Biochemistry
|July 1, 1988
PubMed
Summary

Routine porphyria screening tests are unreliable, often yielding incorrect results. New spectrophotometric methods for urine and fecal porphyrin analysis offer improved accuracy for diagnosing this condition.

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Area of Science:

  • Clinical Chemistry
  • Biochemical Diagnostics
  • Medical Laboratory Science

Background:

  • Porphyria diagnosis relies on screening tests.
  • Previous screening methods have shown diagnostic limitations.
  • Clinical utility assessment is crucial for laboratory diagnostics.

Purpose of the Study:

  • To evaluate the clinical utility of current screening tests for porphyria.
  • To identify limitations in routine laboratory screening for porphyria.
  • To propose improved diagnostic methods for porphyria.

Main Methods:

  • Clinical utility assessment of screening tests in 201 referred cases.
  • Analysis of false negative and false positive results from routine screening.
  • Evaluation of spectrophotometric scanning of urine and fecal extracts for porphyrin detection.

Main Results:

  • Routine screening identified only 43% of porphyria cases correctly.
  • Significant rates of false negative and false positive results were observed.
  • Poor analytical sensitivity was identified as a key issue with current methods.

Conclusions:

  • Current routine screening tests for porphyria lack sufficient clinical utility.
  • Spectrophotometric semiquantitative tests for porphyrins show promise for improved diagnosis.
  • Adoption of advanced analytical techniques is recommended for accurate porphyria screening.

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