Expired allergy tests: a hidden goldmine or a diagnostic risk?
NCT ID NCT07765563
First seen Aug 14, 2026 · Last updated Aug 14, 2026
Summary
This study tests whether expired patch test allergens can still accurately diagnose allergic contact dermatitis, a common skin condition. Adults referred for patch testing will receive both expired and non-expired allergens on their skin at the same time. The researchers will compare the reactions to see if the expired versions give the same results. If they do, it could lead to significant cost savings and wider availability of testing.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- Expired and non-expired patch test allergens
- What this could lead to
- If expired allergens work as well as fresh ones, clinics could save money and make patch testing more accessible.
- What could go wrong
- Expired allergens may degrade and produce inaccurate results, leading to misdiagnosis. The study is small and results may not apply to all allergens.
This is an AI summary of the original study and may miss details. Read our disclaimer.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Richmond Road Diagnostic Treatment Centre
Calgary, Alberta, T2T 5C7, Canada
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