Comparison of pregnancy outcomes between 4th day morula and 5th day blastocyst after embryo transfer: a retrospective cohort study

• Main Authors: Yiqun Sun (Author), Qi Shen (Author), Haitao Xi (Author), Liucai Sui (Author), Yanghua Fu (Author), Junzhao Zhao (Author)
• Format: Book
• Published: BMC, 2024-07-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.

Abstract Background This study was designed to evaluate pregnancy outcomes between morulae transferred on day 4 (D4) and blastocysts transferred on day 5 (D5). Methods From September 2017 to September 2020, 1963 fresh transfer cycles underwent early follicular phase extra-long protocol for assisted...