Effects of E2, P4 and LH Levels on the Day of Transfer and Endometrial Cavity Thickness on Implantation Success in Patients With Frozen-thawed Embryo Transfer Cycle

Progesteron supplementation was initiated by the use of 100 mg of a vaginal progesterone tablet two times daily (Lutinus, Ferring Pharmaceuticals) plus 250 mg of intramuscular hydroxyprogesterone caproate in oil twice a week (IMHPC) as luteal phase support (referred to as day 0 of progesterone administration).

Progesterone level \<10 ng/mL on ET day. If serum progesterone levels were \<10 ng/ml at ET day, 25 mg/d of SC progesterone daily (Prolutex) was given to patients and ET was performed on the same day and the blood sample was taken 2 days later to check serum progesterone levels.