Progesterone level on embryo transfer day and pregnancy after frozen embryo transfer

Is this trial a fit for you?

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This observational study will record serum progesterone levels on the day of embryo transfer in HRT-FET cycles and categorize patients by those levels. Clinical pregnancy rate is the primary outcome, with biochemical pregnancy, implantation rate, early pregnancy loss, and ectopic pregnancy as secondary outcomes. Eligible participants are infertility patients aged 18–41 with BMI under 30 who transfer at least one good-quality embryo; patients with severe untreated endocrine or uterine conditions are excluded. All procedures and sample collection occur at The Chinese University of Hong Kong and outcomes will be compared across progesterone level groups.

Why it matters

Who can join: the full rules

Inclusion Criteria:

* Patients undergoing FET cycles
* Infertility patients aged \>18 years old and \< 42 years old
* BMI \< 30 kg/m2
* Transfer of at least one good-quality embryo.

Exclusion Criteria:

* Severe endocrine disorders (e.g., thyroid dysfunction, premature ovarian failure).
* Severe uterine factors without treatment (severe endometriosis, extensive or subendometrial fibroid, uterine adherent, endometrial polyps)

Where it's running

• The Chinese University of Hong Kong
  Hong Kong, China Recruiting

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How to take part

1. Review the eligibility criteria above with your treating physician.
2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.