Luteal Phase Progesterone Supplementation for Conception

Evidence-Based Recommendations for IVF/ICSI with Frozen Embryo Transfer (FET)

• The American Society for Reproductive Medicine recommends progesterone supplementation be initiated based on cycle type, with natural or ovarian stimulation cycles beginning routine progesterone supplementation after ovulation or after luteinization, and artificial (programmed) cycles starting progesterone supplementation on the day of endometrial transformation 1, 2
• The American Society for Reproductive Medicine suggests continuing luteal support for 1-3 weeks after ultrasound confirmation of viable intrauterine pregnancy (approximately 4 weeks post-transfer) in natural/stimulation cycles, and continuing estrogen and progesterone at original doses for 3-4 weeks after pregnancy confirmation, then gradually tapering over 2 weeks in artificial cycles 1, 2

Pharmacological Considerations for Progesterone Formulations

• The American College of Obstetricians and Gynecologists notes that progesterone formulations are not interchangeable across clinical indications, with injectable 17-hydroxyprogesterone caproate (17P) specifically indicated for preterm birth prevention in women with prior spontaneous preterm birth, not for luteal phase support in conception attempts 3, 5
• The American College of Clinical Pharmacology advises against substituting vaginal progesterone for 17P in women with prior spontaneous preterm birth, as these formulations have different evidence bases and are not interchangeable 3, 4

Patient-Specific Considerations

• The National Institute of Diabetes and Digestive and Kidney Diseases recommends avoiding progesterone-containing contraceptives (pills, implants, IUDs) in women with acute hepatic porphyrias, as progestins can precipitate acute attacks 6