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Twin pregnancies may weaken bones more than singles, new study suggests

NCT ID NCT07508553

Knowledge-focused Sponsor: Fondazione Policlinico Universitario Agostino Gemelli IRCCS Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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 Results may not be published yet.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
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This status has not been confirmed recently, so it may be out of date.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 looks at bone density in 100 pregnant women (ages 30-45) with either one baby or twins during the third trimester. Researchers use a special ultrasound-like scan and questionnaires to check bone health and fracture risk. The goal is to see if carrying twins leads to greater bone loss than carrying a single baby.

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

About 100 people

The number the study aims to enrol. It can still change while the study runs.

Started

Dec 2025

Expected to finish

Dec 2027

An estimate. End dates often move.

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

30 to 45 years

Sex

Female participants only

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 1. Signed informed consent 2. Willingness to participate in the study and ability to complete the study questionnaires 3. Women between 35 and 41 weeks of gestational age at the time of study inclusion 4. Singleton or twin pregnancy (dichorionic or monochorionic) 5. Age between 30 and 45 years at the time of study recruitment 6. No history of recent or previous bone fractures or traumatic fractures, and no motor disabilities (in the mother). 7. Absence of a diagnosis of osteopenia or osteoporosis according to the criteria of the Italian Society for Osteoporosis, Mineral Metabolism and Bone Diseases (SIOMMMS). 8. No intake of vitamin D or other medications during pregnancy. 9. Absence of current or previous conditions that could potentially interfere with bone metabolism (e.g., thyroid, kidney, or liver disease). 10. Women of normal weight or with class I obesity (BMI between 18.5 and 34). EXCLUSION CRITERIA Patients will not be included in the study if at least one of the following exclusion criteria is met: 1. Failure to sign the informed consent form 2. Poor compliance and/or inability to complete the study questionnaires 3. Women with previous or newly diagnosed comorbidities during pregnancy 4. Age \<30 and \>45 years 5. Previous diagnosis of osteopenia or osteoporosis according to the criteria of the Italian Society for Osteoporosis, Mineral Metabolism and Bone Diseases (SIOMMMS) 6. BMI \<18.5 or \>34

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Conditions

The condition(s) this trial relates to.

osteoporosis

As listed by the trial registrant

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

Osteoporosis Pregnancy Twin pregnancy

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Fondazione Policlinico Universitario A. Gemelli IRCCS

    RECRUITING

    Roma, RM, 00168, Italy

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