NCT02251925.

Trial name or title	Frozen embryo transfer in natural and hormonal replacement cycles
Methods	Randomised, open‐label
Participants	460 women 20‐37 years with regular menstruation cycles; undergoing long protocol; BMI ≤ 30 kg/m2; undergoing frozen embryo transfer for the first time
Interventions	Natural cycle (with or without HCG for ovulation induction) or hormonal cycle (with or without administration of GnRHa) or injection of GnRHa (Superfact) at a SC daily dose of 0.5 mg or hormonal group without GnRHa, endometrial preparation with daily administration of 6 mg estradiol valerate
Outcomes	Primary: clinical pregnancy rate Secondary: implantation rate; chemical pregnancy rates; ongoing pregnancy; miscarriage rate
Starting date	September 2012, completion date November 2015
Contact information	Dr Nasser Aghdami nasser.aghdami@royaninstitute.org
Notes