Duration of progesterone exposure before frozen embryo transfer impacts live birth rates following single vitrified-thawed day 6 blastocyst transfer: a multicenter cohort study

Key Points

• Live birth rates increase with longer progesterone exposure before frozen embryo transfer.
• The association shows live birth rates reaching 45% with prolonged progesterone use.
• Observational analysis across multiple centers evaluates progesterone's influence on outcomes.
• These findings suggest a need for optimizing progesterone timing to enhance fertility treatments.