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New blood test could unmask hidden bleeding disorders

NCT ID NCT01957345

Diagnosis Sponsor: University Hospital, Toulouse Source: ClinicalTrials.gov ↗

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 tested a new lab method to diagnose platelet function disorders in 322 people with bleeding symptoms. The method uses flow cytometry to detect signaling defects in platelets, which are often missed by standard tests. The goal was to standardize the technique across multiple labs and establish reference values. If proven reliable, this approach could help identify the cause of bleeding in patients who currently have no clear diagnosis.

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 lead to a simpler, more accurate blood test to diagnose hidden platelet disorders in people with unexplained bleeding.
What could go wrong
This is an early-stage method validation study, not a treatment trial. The test may not prove reliable enough for routine use, and results may vary between labs.

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

322 people

The number who actually took part.

Start date

Feb 2013

Finished

Jun 2017

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: * patient consulting for hemorrhagic symptomatology with a bleeding disorder definitely other than of platelet origin (e.g. "low" von Willebrand) / or constitutional platelet disorder (e.g. Glanzmann thrombasthenia) / or with a defect of platelet function of unknown origin, potentially defective in signalling pathway. * Informed consent form * patient with social security insurance or equivalent Exclusion Criteria: * treatment interfering with platelets function within 7 days prior to enrollment * thrombocytopenia \<100G/L * pregnant or lactating females * subjects under juridical protection guardianship or tutelage measure * subjects involved in another clinical trial

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Conditions

The condition(s) this trial relates to.

blood platelet disease Glanzmann thrombasthenia inherited bleeding disorder, platelet-type qualitative platelet defect

As listed by the trial registrant

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

Platelet dysfunction

Contacts and locations

Locations

  • University Hospital Toulouse

    Toulouse, 31000, France

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