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What's a normal serotonin level? new study aims to find out

NCT ID NCT06910774

Knowledge-focused Sponsor: Centre Hospitalier Sud Francilien 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study measured serotonin levels in 100 healthy adults to establish what is normal for different ages and sexes. Participants did not need extra blood draws—samples leftover from routine care were used. The results will help doctors interpret serotonin tests in the future.

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.

Participants

100 people

The number who actually took part.

Started

Jun 2025

Finished

Nov 2025

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

The study population is a control cohort. We will include adult patients aged 18 years or older who have undergone a blood draw at CHSF during the recruitment period. Eligible participants must have hemoglobin, white blood cell, and platelet counts within the laboratory's normal ranges, and a C-reactive protein (CRP) level below 30 mg/L.

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: * Adult patients aged ≥ 18 years * Who have undergone a blood draw at CHSF during the recruitment period * With hemoglobin, white blood cell, and platelet counts within the laboratory's normal ranges * With a C-reactive protein (CRP) level \< 30 mg/L Exclusion Criteria: * Patients informed about the study who decline participation * Patients with a current diagnosis or history of psychiatric disorders * Patients on antidepressants or narcotics at the time of sampling

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Conditions

The condition(s) this trial relates to.

Coitus

As listed by the trial registrant

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

No condition : to establish reference serum serotonin levels in A control cohort

Contacts and locations

Locations

  • Centre Hospitalier Sud Francilien

    Corbeil-Essonnes, France, 91110, France