The Role of hCG in Thawed Embryo Transfer

Eligibility Criteria

• 1. Female adult expecting to receive transfer of a thawed embryo.
• 2. At least one available frozen blastocyst of transferrable quality.
• 3. Non-menopausal female with at least one antral follicle.
• 4. Use of pre-implantation genetic testing (PGT), embryos derived from donor oocytes and/or donor sperm, a gestational carrier, and history of prior transfer(s) regardless of outcome are allowed.
• 5. Subsequent embryo transfers after failed transfers under this study are allowed, but not after a transfer that has resulted in ongoing pregnancy at ten weeks gestation under this study.
• 1. Minors (age\<18 years).
• 2. Use of embryo(s) frozen at another center.
• 3. Patient insistent on transfer of two embryos.
• 4. Patient or partner unable to provide informed consent in English.
• 5. Patient already enrolled in any other research study for her embryo transfer.
• 6. History of anti-phospholipid syndrome or any other indication for use of Lovenox in pregnancy.
• 7. Patient for whom the physician assesses this protocol is inappropriate or unsafe.