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Does Dad's smoking harm fertility? new study investigates

NCT ID NCT02803658

Knowledge-focused Sponsor: Centre Hospitalier Universitaire, Amiens 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 Results may not be published yet.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 This study
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This status has not been confirmed recently, so it may be out of date.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 looked at how a man's smoking habits might affect a couple's ability to have a baby. Researchers compared fertile and infertile couples, measuring smoking markers like carbon monoxide and cotinine in blood, semen, and hair. The goal was to understand if smoking damages sperm and contributes to infertility, but the study was stopped early, so results are limited.

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 study could clarify how male smoking impacts fertility, potentially guiding lifestyle advice for couples trying to conceive.
What could go wrong
The study was terminated early with only 154 participants, so results may be incomplete or inconclusive. Observational studies cannot prove cause and effect.

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

154 people

The number who actually took part.

Started

Dec 2012

Finished

Oct 2018

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 to 45 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: * Fertile couples = control cases (with spontaneously conceived a child with a time required to design less than 12 months) and whose wife gives birth in one of the two maternity hospitals participating in the study * All couples candidates for AMP: reproductive age couples (Female age \<35 years of age men \<40 years), infertility (primary infertility, inability to conceive after 12 months of no sex protected). 1st or 2nd attempt at in vitro fertilization * For infertile couples, couples in which we note 1. spouses have sperm characteristics compatible with a natural pregnancy: an normospermie (\> 20 million / ml) or moderate oligozoospermia (5-20 million sperm per ml) idiopathic (or exclusion criteria) 2. where the partner does not exhibit anovulation or tubal pathology-proven utero, whose ovarian reserve is normal (FSH and estradiol rate J2 / 3 of cycle) ,. Exclusion Criteria: * Female age \> 35 years Women\> 45 years * Co- infections of one of the two members of the couple (or 2) by HIV, HBV and / or HCV * Severe Oligospermia humans ( \<5000 000 sperm) or azzoospermie * A normospermie or moderate oligozoospermia (5-20 million sperm per ml) nonidiopathic * Will also be excluded couples where the partner has anovulation or uterotubal proven pathology , impaired ovarian reserve or chronic viral disease

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Conditions

The condition(s) this trial relates to.

infertility disorder Smoking

As listed by the trial registrant

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

Infertility

Contacts and locations

Locations

  • CHU Amiens

    Amiens, 80054, France

  • CHU Caen

    Caen, 14033, France

More trials for these conditions

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