Clinical Trial

Natural Versus Programmed Frozen Embryo Transfer (NatPro)

Study acronym: NatPro
Active, Not Recruiting Phase 3
View on ClinicalTrials.gov →
Record status
This record was last updated May 16, 2025 (before its estimated February 1, 2026 completion). Its status may not reflect the trial's current state.
Summary
NatPro is a two-arm, parallel-group, multi-center, randomized trial in which women undergoing frozen embryo transfer (FET) will be randomized to receive either a modified natural cycle (corpus luteum present) or a programmed cycle (corpus luteum absent).
Protocol Amendment History 11 amendments
This ClinicalTrials.gov record has been amended 11 times since 2020-09-15; most recent amendment 2025-05-15.
Status change: Recruiting → Active, Not Recruiting 2025-01-07
Trial Details
NCT Number NCT04551807
Lead Sponsor JHSPH Center for Clinical Trials
Conditions Pregnancy Related, Pre-Eclampsia
Enrollment 788 participants
Start Date 2020-09-16
Primary Completion 2026-02-01 (estimated)
Study Completion 2026-04-01 (estimated)
Updated on ClinicalTrials.gov 2025-05-16