Embryo Transfer Outcomes After Vitrification With Slush Nitrogen Compared to Liquid Nitrogen

Exclusion Criteria

• •1. All patients who do not voluntarily give their written consent for participation
• •2. Under 18 years old, above 42 years old
• •3. BMI \> 35
• •4. Maximum day 3 Follicle stimulating hormone (FSH) level of 12 or higher
• •5. Anti-mullerian hormone (AMH) level less than 1.0 g/mL, tested within previous year
• •6. Total basal antral follicle count less than 6 follicles
• •7. Failed more than one previous FET cycle
• •8. Use of oocyte donation
• •9. Use of gestational carrier
• •10. Presence of hydrosalpinges that communicate with endometrial cavity
• •11. Diagnosis of endometrial insufficiency: prior cycle with maximal endometrial thickness ≤ 6mm, abnormal endometrial pattern (failure to attain a trilaminar appearance), persistent endometrial fluid
• •12. Uncorrected uterine factor infertility (uterine anomaly, submucosal myomas, uterine septum)
• •13. Single gene disorder chromosomal rearrangement requiring a more detailed embryonic genetic analysis
• •14. Male partner with \<100,000 total motile spermatozoa per ejaculate (donor sperm is acceptable)
• •15. Use of surgical procedures to obtain sperm
• •16. Couples undergoing IVF for fertility preservation with no immediate plan for subsequent FET (embryo banking)
• •17. Sex selection
• •18. Personal history of repeated pregnancy loss (two or more unexplained clinical losses defined by presence of fetal heartbeat)