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Related Experiment Videos

Estimation of skin prick test reactions with a scanning program

H Pijnenborg1, L Nilsson, S Dreborg

  • 1Medical Faculty, University of Limburg, Maastricht, The Netherlands.

Allergy
|November 1, 1996
PubMed
Summary

A new computer scanning method accurately measures skin prick test wheal areas, showing high precision and lower variation than traditional diameter measurements for allergy testing.

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Area of Science:

  • Dermatology
  • Allergology
  • Medical Imaging

Background:

  • Skin prick testing is crucial for diagnosing allergies.
  • Accurate measurement of wheal size is essential for reliable results.
  • Current methods for measuring wheal areas can be subjective and variable.

Purpose of the Study:

  • To evaluate a novel computer-based scanning method for measuring skin prick test wheal areas.
  • To assess the accuracy, precision, and inter- and intraoperator variability of the new scanning technique.
  • To compare the new area measurement method with the traditional diameter measurement method.

Main Methods:

  • Calibration of the scanning program using constructed circles of known areas.
  • Scanning wheals in different contrast modes.

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  • Investigating inter- and intraoperator variations.
  • Comparing computer-scanned areas with wheal diameters for histamine and egg challenges in 82 and 75 patients, respectively.

    • Main Results:

    • The computer scanning method demonstrated high accuracy, with measured areas closely matching real areas (97.4-100.8%, P < 0.01), except for the smallest test areas.
    • Low coefficients of variation (c.v.) were observed: intraoperator (1.4%), day-to-day (1.9%), and interoperator (2.3%).
    • The scanning method yielded significantly smaller wheal areas compared to the diameter method (126% for histamine, 129% for egg) and showed lower variability (c.v.).

    Conclusions:

    • The computer-based scanning method is precise and accurate for measuring skin prick test wheal areas.
    • This method is recommended for consistent registration of skin test reactions in scientific trials.
    • Despite the scanner's precision, the overall reproducibility of skin testing remains a challenge, likely due to technique variability.