This information is vital for timing of appropriate obstetric care; scheduling and interpretation of certain antepartum tests; determining the appropriateness of fetal growth; and designing interventions to prevent preterm births, postterm births, and related morbidities.
We keep them up because there are a ton of great conversations here and we believe you deserve to see them all. Did you get any info yet? For instance, the EDD for a pregnancy that resulted from in vitro fertilization should be assigned using the age of the embryo and the date of transfer. The guy after that would be a much better father and partner for her, if they chose to stay together. She may have stopped sooner than that, but definitely no later than the 21st. New charts for ultrasound dating of pregnancy and assessment of fetal growth: