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Expired allergy tests: a hidden goldmine or a diagnostic risk?

NCT ID NCT07765563

Diagnosis Sponsor: University of Calgary Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

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.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 4

Runs after approval, following long-term safety and how well the treatment works in everyday use.

Participants

About 100 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Sep 2026

An estimate. Start dates often move.

Expected to finish

Dec 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Adults (age 18 years or older) referred for patch testing. Exclusion Criteria: * Relative or absolute contraindication to patch testing * Wide spread dermatitis prior to patch placement * Inability to return to clinic for reading of results * Patient non-consenting

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Conditions

The condition(s) this trial relates to.

allergic contact dermatitis contact dermatitis

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Allergic contact dermatitis

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Richmond Road Diagnostic Treatment Centre

    Calgary, Alberta, T2T 5C7, Canada

More trials for these conditions

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