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What is the Best Preparation for Embryo Transfer in Cryo Cycles: a Natural Cycle or Light Hormonal Stimulation?

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified September 2014 by Thomas D'Hooghe, University Hospital, Gasthuisberg.
Recruitment status was:  Active, not recruiting
Information provided by (Responsible Party):
Thomas D'Hooghe, University Hospital, Gasthuisberg Identifier:
First received: June 26, 2007
Last updated: September 9, 2014
Last verified: September 2014
The study investigates if, among women with a regular cycle (between 25 and 45 days), the endometrium is better prepared for the transfer of an embryo that was cryopreserved and if the subsequent embryo implantation rate is higher when the cycle is started with daily, small-dose hormonal injections than in cycles without these daily injections.

Condition Intervention
Infertility Drug: human menopausal gonadotrophins

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Natural Cycle Versus Stimulation With Human Menopausal Gonadotropin in Cycles With Cryopreserved Embryos

Further study details as provided by Thomas D'Hooghe, University Hospital, Gasthuisberg:

Primary Outcome Measures:
  • implantation rate per embryo [ Time Frame: 15 days after the embryo transfer ]

Secondary Outcome Measures:
  • thickness of the endometrium [ Time Frame: 0-2 days before the human chorionic gonadotropin (hCG) injection ]

Estimated Enrollment: 300
Study Start Date: January 2004
Estimated Study Completion Date: October 2014
Primary Completion Date: October 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: 1
Daily injections with a small dose of gonadotrophins from day 2 of the cycle
Drug: human menopausal gonadotrophins
Daily subcutaneous injections, dose 37.5 IU or 75 IU, start on day 2 of the menstrual cycle until ovulation
Other Name: Menopur
No Intervention: 2
No daily injections with hormones


Ages Eligible for Study:   21 Years to 45 Years   (Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Signed informed consent.
  • Women with a regular cycle (between 21 and 35 days).
  • Embryos with 50% intact blastomeres after thawing.
  • Embryo and endometrium are synchronized.

Exclusion Criteria:

  • Embryo storage time not longer than 5 years.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00492934

Leuven University Fertility Center
Leuven, Vlaams Brabant, Belgium, 3000
Sponsors and Collaborators
University Hospital, Gasthuisberg
Study Director: Thomas D'Hooghe, MD, PhD University Hospital Gasthuisberg, Catholic University Leuven, Belgium
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Thomas D'Hooghe, Professor, Medical Doctor, University Hospital, Gasthuisberg Identifier: NCT00492934     History of Changes
Other Study ID Numbers: ML2436 - 30/12/2003
Study First Received: June 26, 2007
Last Updated: September 9, 2014

Keywords provided by Thomas D'Hooghe, University Hospital, Gasthuisberg:
endometrium thickness
implantation rate
embryo cryopreservation
embryo transfer

Additional relevant MeSH terms:
Genital Diseases, Male
Genital Diseases, Female
Fertility Agents, Female
Fertility Agents
Reproductive Control Agents
Physiological Effects of Drugs processed this record on September 19, 2017