Increased sensitivity of patch testing by standardized tape stripping beforehand: a multicentre diagnostic accuracy...

Area of Science:

• Dermatology
• Allergology
• Diagnostic Accuracy

Background:

• Patch testing is a standard method for diagnosing allergic contact dermatitis.
• The strip patch test, a modification, aims for improved sensitivity and reliability.
• Comparative diagnostic accuracy data between strip patch tests and standard patch tests were lacking.

Purpose of the Study:

• To compare the diagnostic accuracy of strip patch tests versus standard patch tests.
• To evaluate the detection of sensitizations in patients with suspected allergic contact dermatitis.
• To use patient history as the established reference standard.

Main Methods:

• A multicentre, prospective, investigator-blinded study enrolled 790 patients.
• Standard patch tests and strip patch tests were performed simultaneously on duplicate skin sites.
• The strip patch test involved a standardized tape-stripping procedure prior to allergen application.

Main Results:

• Strip patch tests demonstrated significantly higher sensitivity for nickel sulfate (16.4% difference) and potassium dichromate (25.0% difference).
• These differences in sensitivity favored the strip patch test for both allergens.
• Seven hundred and eighty-seven patients were included in the final analysis.

Conclusions:

• The standardized strip patch test is accurate and clinically safe.
• This method shows promise for enhancing the diagnosis of allergic contact dermatitis.
• Strip patch testing may offer superior diagnostic performance over conventional patch testing.