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Can a simple breath test cut asthma Flare-Ups?

NCT ID NCT05853809

Disease control Sponsor: Region Stockholm 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 18, 2026 · Last updated Sep 18, 2026

Summary

Researchers are testing whether a breath test called FeNO, which measures inflammation in the airways, can help primary care doctors better adjust asthma treatment for adults. The study assigns entire clinics to either use FeNO measurements alongside usual care or continue with usual care alone. The main question is whether using FeNO reduces the number of asthma flare-ups. Secondary goals include improving asthma control and lung function.

What this could mean

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

Active substance
FeNO measurement, a breath test that measures airway inflammation to guide asthma treatment
What this could lead to
If it works, doctors in primary care could use a simple breath test to tailor asthma treatment, which may mean fewer flare-ups and better day-to-day control for patients.
What could go wrong
This is a real-world study in primary care, so results may vary between clinics and may not apply everywhere. Measuring inflammation does not guarantee better outcomes, and the test adds time and cost to routine visits.

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

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

3,254 people

The number who actually took part.

Started

Apr 2023

Finished

Jun 2025

Lead sponsor

A government agency

The lead sponsor is a government body.

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: * Physician diagnosed asthma according to medical record. * Patients seeking advice for symptoms suggestive of asthma Exclusion Criteria: * Physician diagnosed COPD (Chronic Obstructive Pulmonary Disease) according to medical record.

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Conditions

The condition(s) this trial relates to.

asthma

As listed by the trial registrant

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

Asthma

Contacts and locations

Locations

  • Region Stockholm

    Stockholm, Sweden

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