Actively Recruiting
Optimal Ovulation Triggering Size in Women 35-44 with Poor Ovarian Reserve Undergoing Ovarian Stimulation
Led by Centrum Clinic IVF Center · Updated on 2026-03-19
200
Participants Needed
1
Research Sites
4 weeks
Total Duration
On this page
AI-Summary
What this Trial Is About
Researchers are evaluating the best timing for ovulation triggering in women aged 35 and older who have a poor ovarian reserve and are undergoing assisted reproductive treatment. This observational study focuses on determining whether triggering ovulation when follicles measure between 13-16 mm compared to when follicles are larger than 17 mm results in a higher number of mature eggs. The study addresses the challenge of obtaining enough mature eggs in older women with low ovarian reserve, an area where current standard practices may not be optimal. Participants will be divided into two groups based on follicle size at the time of ovulation triggering: the experimental group triggers at 13-16 mm follicle size, while the control group triggers at larger than 17 mm. All participants receive the same ovulation trigger treatment consisting of 6500 units of recombinant hCG and 0.2 mg triptorelin injections. Ovarian stimulation is monitored through serial ultrasounds and hormone measurements during the treatment period. During the study, women will undergo regular ultrasound exams and hormone tests to track follicle development and ovulation timing. Researchers will compare the number of mature eggs retrieved, fertilization rates, embryo counts, and implantation rates between the two groups. The primary measurement is the change in the number of mature eggs from enrollment to the end of treatment over 6 to 8 months. This study is sponsored by Centrum Clinic IVF Center and participation duration may vary depending on individual treatment schedules.
CONDITIONS
Brief Title
BEst Size for Ovulation Triggering in Poseidon 4 Patients (BEST 4 Study)
Who Can Participate
Eligibility Criteria
You may qualify if you...
- Women aged 35 years or older
- Women with low serum AMH levels (less than 1.2 ng/ml)
- Women with low antral follicle count (less than 5)
- Women undergoing assisted reproduction with short antagonist or long agonist protocols
- Women who have used a maximum daily gonadotropin dose of 300 IU
You will not qualify if you...
- Women younger than 35 years
- Ovarian reserve parameters not meeting the POSEIDON group 4 definition
- Natural or modified natural cycles without controlled ovarian stimulation
- In vitro maturation (IVM) cycles
- Luteal-phase stimulation or DuoStim protocols
- Preimplantation genetic testing cycles unless specified for stratified analyses
- Major untreated uterine cavity pathology or untreated hydrosalpinx
- Cycles with missing or incomplete follicular measurement data on trigger day
- Cycles with non-standardized or undocumented trigger-to-oocyte retrieval intervals
AI-Screening
AI-Powered Screening
Complete this quick 3-step screening to check your eligibility
Your Study Journey
Duration - 2 to 4 weeks
Participants are screened for eligibility to participate in the trial.
1 visit (in-person)
Duration - Up to 6 to 8 months
Participants undergo controlled ovarian stimulation with serial ultrasound examinations and serum hormone measurements to monitor follicle development.
Regular ultrasound and hormone measurement visits during stimulation
Duration - Single event within the treatment period
Participants receive ovulation triggering injections when the leading follicle reaches the assigned size threshold, followed by oocyte retrieval.
1 visit for ovulation trigger and oocyte retrieval
Trial Site Locations
Total: 1 location
1
Centrum Clinic IVF Center
Ankara, Ankara, Turkey (Türkiye), 06800
Actively Recruiting
Research Team
E
Emre G Pabuccu, Professor
R
Recai Pabuccu, Professor
How is the study designed?
Study Type
OBSERVATIONAL
Masking
N/A
Allocation
N/A
Model
N/A
Primary Purpose
N/A
Number of Arms
1
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