IRCT20191031045292N1.

Study name	Comparing the effect of endometrial scratch with luteal phase versus follicular phase in FET women candidates outcome
Methods	RCT
Participants	Women candidates for the freeze‐frozen transfer cycle
Interventions	Intervention1: scratched at the beginning of the follicular phase with the onset of estradiol with a pipelle catheter. Intervention2: scratched in the mid‐lethal phase of the preceding cycle.
Outcomes	Clinical pregnancy
Starting date	Expected: 22 November 2019
Contact information	Shamim Pilehvar: +98 81 3827 7459, sh.pilehvar@umsha.ac.ir
Notes	Trial registration status on 2 July 2020: recruiting. Trial registered on 16 December 2019. Correspondence attempted, however the email bounced back.