Can a simple hormone test predict miscarriage in breastfeeding moms?
NCT ID NCT07357922
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study will measure progesterone levels in 150 pregnant women who are still breastfeeding to see if low levels are linked to threatened abortion (bleeding in early pregnancy). Researchers hope to find a way to identify women at higher risk of early pregnancy loss. The study is observational, meaning it only looks at existing data and does not test any treatment.
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 help doctors better predict and prevent early pregnancy loss in women who conceive while breastfeeding.
- What could go wrong
- This is an observational study, not a treatment trial. It only measures hormone levels and outcomes, so it cannot prove cause or lead directly to a new therapy.
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
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About 150 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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Jan 2026
An estimate. Start dates often move.
- Expected to finish
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Jan 2028
An estimate. End dates often move.
- Lead sponsor
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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 consists of lactating pregnant women aged 18 to 50 years who present for routine antenatal care during the first trimester of pregnancy at the participating obstetrics and gynecology clinics. Eligible participants include women who conceived while breastfeeding and have available first-trimester serum progesterone measurements. Participants will be prospectively followed to evaluate the occurrence of threatened abortion and early pregnancy outcomes.
- Ages
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18 to 50 years
- Sex
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Female participants only
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide 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: * Female participants aged 18 to 50 years. * Pregnant women who conceived during the lactation period. * Singleton pregnancy. * First-trimester pregnancy. * Availability of first-trimester serum progesterone measurement obtained as part of routine antenatal care. * Ongoing follow-up at the participating hospitals. Exclusion Criteria: * Age under 18 years or over 50 years. * Multiple pregnancies. * Known chronic medical diseases. * Use of progesterone supplementation before serum progesterone measurement. * Missing or incomplete clinical or laboratory data.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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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.