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Updated: Apr 18, 2026

In Vitro Imaging and Quantification of the Drug Targeting Efficiency of Fluorescently Labeled GnRH Analogues
Published on: March 21, 2017
GnRH-antagonist programming versus GnRH agonist protocol: a randomized trial
Anat Hershko Klement1, Arie Berkovitz1, Amir Wiser1
1The IVF Unit, Department of Obstetrics and Gynecology, Meir Medical Center, 59 Tschernihovsky St., Kfar Saba 44299, Israel.
Objective:
Testing the ability to program IVF GnRH-antagonist cycles to avoid weekend oocyte retrieval.
Study Design:
Preliminary randomized clinical trial. Patients presenting an indication for IVF or IVF-ICSI were assigned into either the Treatment Group - GnRH antagonist protocol, programmed to start stimulatory agents on a Friday, with oral 2mg estradiol valerate twice a day from the 2nd day of cycle until the first Friday to follow, or to the Control Group - long luteal GnRH agonist protocol.
Results:
The performance of 27 Treatment Group patients and 24 Control Group patients was analyzed. Cycle dynamics were not clinically or statistically different except for a significant difference in the number of follicles measuring ≥18 mm on hCG administration day. There were no differences in the number of aspirated ova, fertilization rates, embryo quality or number of embryos to be transferred. Pregnancy rate was 41.7% in the Treatment Group and 50% in the Control Group (P>0.5). Only one patient assigned to the Treatment Group had a weekend retrieval.
Conclusions:
Preliminary results demonstrate no compromise related to follicular estrogen programming in a GnRH antagonist protocol and provide reassurance regarding the ability to achieve programming goals.
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