**3. Options of luteal support in ART**

To correct the luteal phase defect in stimulated IVF/ICSI cycles, progesterone and /or human chorionic gonadotrophin (hCG) can be administered. The addition of estardiol to progesterone luteal support is currently debated and the final situation in luteal phase support needs further studies. The use of GnRh agonist in luteal support has been recommended in more recent studies.
