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Sniffing out clues: smell tests may reveal brain secrets in bipolar disorder

NCT ID NCT06809881

Knowledge-focused Sponsor: Institut National de la Santé Et de la Recherche Médicale, France 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 26, 2026 · Last updated Jun 26, 2026

Summary

This completed study compared smell abilities and brain scans between 240 people with bipolar disorder and healthy volunteers. Researchers tested odor threshold, discrimination, and identification to see if smell performance differs and relates to brain structure. The goal is to better understand the condition, not to test a treatment.

What this could mean

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

What this could lead to
If successful, this could reveal how smell relates to brain changes in bipolar disorder, pointing toward new ways to monitor the condition.
What could go wrong
This is an observational study, not a treatment trial. Results may not lead to direct clinical benefits or apply to all patients.

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

240 people

The number who actually took part.

Started

Jan 2016

Finished

Jan 2020

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 to 65 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * Patients with BD and HC * Fluent in french * Having a public health insurance * Not being on tutorship Exclusion Criteria: * Family history of bipolar disorder for controls * Alcohol dependence

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Conditions

The condition(s) this trial relates to.

bipolar disorder

As listed by the trial registrant

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

Bipolar disorder

Contacts and locations

Locations

  • Inserm U 955 Eq 15

    Créteil, VAL DE MARNE, 94000, France

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