• Accurately determining the Estimated Date of Delivery (EDD) and Estimated Gestational Age (EGA) for pregnancies conceived via In Vitro Fertilization.
• Bypassing the standard Last Menstrual Period (LMP) method entirely due to ovulation induction suppression.
• Interpreting Anti-Müllerian Hormone (AMH) levels for ovarian reserve testing.

• Standard Human Gestational Period = 280 days (from LMP) or 266 days (from conception).
• For a Day 3 Embryo (Cleavage Stage): EDD = Transfer Date + 266 Days - 3 Days
• For a Day 5 Embryo (Blastocyst): EDD = Transfer Date + 266 Days - 5 Days

• A very low AMH (<0.7) means the patient will have immense difficulty retrieving multiple eggs during IVF. It DOES NOT mean the patient cannot spontaneously get pregnant globally; egg quality is tied to age, not AMH pool size.
• Oral contraceptive pills (OCPs) can artificially suppress AMH levels. If a patient gets an AMH tested while on the pill, the result is falsely terrifying.

• Continue progesterone supplementation through 10-12 weeks until the placenta takes over production (corpus luteum rescue).
• Schedule a viability ultrasound at 7-8 weeks.
• Offer fetal echocardiogram at 20-22 weeks due to the slightly increased background risk of congenital heart defects in IVF/ICSI neonates.
• Monitor for preeclampsia (IVF with frozen embryo transfer strongly correlates with higher risk of hypertensive disorders of pregnancy).

The absolute precision of IVF dating revolutionized modern obstetrics, allowing clinicians to bypass the inherent unreliability of maternal menstrual history and identifying cases of true fetal growth restriction (FGR) with perfect denominators.