Oxford Luteal Dysfunction and Placental Insufficiency Study
Starting soon
Conditions studied: Pre-eclampsia
In brief
High blood pressure (BP) affects approximately 1 in 10 pregnancies. About half of women with high blood pressure in pregnancy develop a serious complication called preeclampsia, which kills over 70,000 women and 500,000 babies every year worldwide. Despite its devastating impact, scientists know little about preeclampsia prevention or treatment. Research has shown that preeclampsia results mainly from an abnormal attachment of the placenta to the lining of the womb. In the first 8 weeks of pregnancy, placental attachment depends on the release of hormones (for example, progesterone) by a gland in the ovary called the corpus luteum. Low blood levels of progesterone in early pregnancy are associated with a reduced chance of having a live baby and higher risk of miscarriage. Giving progesterone to women at risk of miscarriage in early pregnancy reduces their chance of developing preeclampsia by nearly 40%. These results highlight the crucial role of the corpus luteum in normal pregnancy, but there is a need for high-quality studies to identify women whose corpus luteum may be defective. Giving these women medicines to treat corpus luteal defects may lead to normal attachment of the placenta, reducing the risk of pregnancy complications such as preeclampsia. The investigators propose a study that will investigate whether ultrasound features of the corpus luteum and blood and urine levels of corpus luteal hormones may predict preeclampsia.
Key facts
- Study ID
- NCT07072052
- Run by
- University of Oxford
- People needed
- 360
- Starts
- 2026-05-01
- Expected to finish
- 2027-01-01
- Last updated by the study team
- 2026-04-23
Who can join
Age: 16 and older. Sex: female. Healthy volunteers: accepted.
You may qualify if…
- Participant is willing and able to give written informed consent for participation in the study.
- Female, aged 16 years or above. As in vitro fertilisation is not undertaken in women younger than 18 years, those with pregnancies resulting from natural cycle frozen embryo transfer will be aged 18 years or above.
- Pregnancy <8 completed weeks of gestation (i.e., up to 7 weeks and 6 days' gestation).
- Conception through any of the following means: unassisted ("natural"), ovulation induction (with clomifene citrate, letrozole or gonadotropin injections, including trigger injection), intrauterine insemination (with or without ovulation induction, including trigger injection), or natural cycle frozen embryo transfer.
- Intrauterine viable pregnancy confirmed on research ultrasound scan.
- Intention to deliver at Oxford University Hospitals.
You may not qualify if…
- Unable to read, or to understand written or spoken English.
- Vaginal bleeding at first visit.
- Miscarriage at first visit, defined as fetal crown-rump length of 7 mm or longer with no visible heartbeat, OR gestational sac with a mean of 25 mm or greater in diameter with no visible fetal pole on ultrasonography.
- Evidence of ectopic pregnancy at first visit.
- Multiple pregnancy.
- Uterine pathology (e.g., uterine polyp, fibroid, septate uterus, uterus didelphys, bicornuate uterus, unicornuate uterus).
- Fresh in vitro fertilisation.
- Donor oocyte in vitro fertilisation.
- Frozen embryo transfer using hormone replacement therapy for endometrial preparation.
- Participation in any concurrent trials of medicinal products in pregnancy.
Where it is running
- Oxford University Hospitals NHS Foundation Trust — Oxford, United Kingdom
Full record on ClinicalTrials.gov
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