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Rapid COVID test vs. gold standard: study aimed to see if cheap antigen tests work for contact tracing

NCT ID NCT04745533

Diagnosis Sponsor: Juan Fernando Masa Jiménez 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
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 Results may not be published yet.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 This study
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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study planned to compare a rapid antigen detection test against the standard PCR test for diagnosing COVID-19 in people who were close contacts of infected patients but had no symptoms. The goal was to see if the quick, inexpensive antigen test could reliably identify contagious individuals during quarantine. However, the study was withdrawn before enrolling any participants, so no data were collected.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Antigen detection test (rapid diagnostic test)
What this could lead to
If successful, this could show that cheap, rapid antigen tests are reliable for screening asymptomatic contacts, helping to quickly identify contagious people and slow virus spread.
What could go wrong
The study was withdrawn before any participants were enrolled, so no results are available. Antigen tests are less sensitive than PCR, especially in people without symptoms, so they might miss some infections.

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.

Started

Feb 2021

Finished

Jun 2021

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.

Who is studied

All subjects considered close contacts of COVID-19 patients according to the definition of the Ministry of Health of Spain in the health area of Cáceres

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: * Subjects considered close contacts of COVID-19 patients according to the definition of the Ministry of Health of Spain at the time of inclusion. Exclusion Criteria: * Subjects who do not obtain their informed consent for the study. * Symptomatic subject at the time of inclusion.

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Conditions

The condition(s) this trial relates to.

severe acute respiratory syndrome

As listed by the trial registrant

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

SARS-CoV infection

More trials for these conditions

Other studies related to the condition(s) this trial covers.