ClinicalTrials.gg
CompletedNCT03898440DAGUpdated Jan 13, 2022

Fetal Ano-genital Distance in 2D Ultrasound.

An observational study in Urogenital Abnormalities, Prenatal Disorder and Sex Development Disorder, sponsored by University Hospital, Brest. Completed at 1 site in France. Open to female participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2022-01-13.

Sponsored by University Hospital, Brest · Observational

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Study type
Observational
Model
Cohort
Time perspective
Prospective
Enrollment
318
Ages
18 Years and older
Sex
Female
01

Where this study stands

Counted across the records on this site · 2026-11-14

Among 10 studies in Disorders of Sex Development with a site in France — 1 open to participants now, 1 under way, none of them phase 3. Disorders of Sex Development · France.

Started
2019
the only one that year
Observational
7 of 10
1 open now
Registered
5th of 10
by date
Lead sponsor
1 of 10
University Hospital, Brest

Among the 10 studies in Disorders of Sex Development with a site in France, this one is the only one that started in 2019, is one of 7 observational ones, and was the 5th registered.

Disorders of Sex Development

32 studies on the registry are indexed under Disorders of Sex Development; 7 are open to participants now.

Browse Disorders of Sex Development studies →

Open to participants now

1 of the 10 studies in Disorders of Sex Development with a site in France is open now. Recruiting first, the newest first:

A study can be open while its sites in France have not opened yet or have stopped. Only those recruiting at a site in France →

Who these studies take

Of the 6 Disorders of Sex Development studies recruiting now, 3 set no upper age limit and 2 stop at 75 or younger; 4 take children under 18; 3 take healthy volunteers.

This study: 18 Years and older · female · healthy volunteers too.

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Watch this landscapeDownload CSVNarrow it in search →With an account: a weekly mail of what changed among 10 studies in Disorders of Sex Development with a site in France, or all of them as a file.
02

Study summary

The purpose of this study is to determine a threshold value of fetal anogenital distance in 2D ultrasound to differentiate male fetuses from female fetuses, starting 18 weeks of gestation and until the due date.

The study also evaluates the feasibility of the measure and its interobserver variability.

Read the detailed description

The anogenital distance of female newborns is shorter than that of male newborns.

Urogenital disorders, such as hypospadias and micro-penis, are associated with a shorter anogenital distance.

Anogenital distance is a good marker of fetal exposure to androgenic substances.

Prenatal anogenital distance ultrasound measure can help the diagnosis in case of doubt about fetal sexual phenotype or in case of urogenital disorder suspicion (hypospadias or micropenis).

Is the anogenital distance easy to make measure? Can this procedure be reproduced? What are the threshold values to determine fetal sex at each term of pregnancy?

03

Conditions studied

  • Urogenital Abnormalities
  • Prenatal Disorder
  • Sex Development Disorder

Keywords

  • anogenital distance
  • prenatal
  • sex determination
  • androgen
04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
Female
Accepts healthy volunteers
Yes
Sampling method
Non-probability sample

Study population

All pregnant women follow up at Brest Hospital to 18 weeks of gestation until term, except suspicion of fetal pelvic malformations and patients without an exact echographic datation of pregnancy between 11 and 13+6 weeks of gestation.

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • pregnant woman
  • sonographic fetal follow up in Brest Hospital
  • term>18 weeks of gestation

Exclusion criteria

Exclusion Criteria:

  • No datation between 11 weeks of gestation and 13 weeks of gestation and 6 days by crown-rump length measurement
  • Minor
  • no consent
  • ultrasound performed by an operator without ultrasonography graduation
05

Study design

Observational model
Cohort
Time perspective
Prospective
Enrollment
318 participants (actual)
Patient registry
No
06

What researchers measure

Primary outcomes

  1. fetal anogenital distance

    The distance will be measured from the center of the anus to the posterior convergence of the fourchette in female fetuses and to the posterior base of the scrotum in male fetuses

    Time frame: During fetal ultrasound exam

Secondary outcomes

  1. Interobserver variability

    reproducibility of the anogenital measure: the measure will be taken by two sonographers during the same exam

    Time frame: During fetal ultrasound exam

  2. Ano-genital distance in mm

    the measure is correctly performed and validated by an expert

    Time frame: During fetal ultrasound exam

  3. Estimated fetal weight

    Impact of estimated fetal weight and anogenital distance

    Time frame: During fetal ultrasound exam

  4. neonatal sex determination

    concordance of anogenital distance and neonatal sex determination

    Time frame: During fetal ultrasound exam

07

Study locations

1 site
  • CHRU de Brest (Morvan)
    Brest, 29200, France
08

References and documents

Individual participant data

Plan to share: Yes — All collected data that underlie results in a publication

Supporting information: Study protocol

Time frame: Data will be available after the publication of result and ending three years maximum following the last visit of the last patient

Access criteria: Data access requests will be reviewed by the internal committee of Brest UH. requestors will be required to sign and complete a data access agreement

No publications or documents are linked to this record.

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reached

Ran from Apr 2019 to primary completion in Sep 2021, 28 months.

How these figures are worked out, and which studies are left out of them.

Registered
Mar 29, 2019
First posted
Apr 2, 2019
StartActual
Apr 15, 2019
Primary completionActual
Sep 4, 2021
CompletionActual
Sep 4, 2021
Last update
Jan 13, 2022
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Jan 13, 2022, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT03898440
Responsible party
Sponsor
First posted
Apr 2, 2019
Start date
Apr 15, 2019
Primary completion
Sep 4, 2021
Completion
Sep 4, 2021
Last update
Jan 13, 2022

Study contacts

Anne-Hélène SALIOU
principal investigator · CHRU Brest - Morvan hospital

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Jan 2021. You cannot join it, but the record below documents what was studied.

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