Calculate estimated due date EDD and gestational age based on: However, ultrasound determination of the date of ovulation has the same imprecision as does the ultrasound estimate of the gestational age and, therefore, a precise date of conception cannot usually be determined as with in vitro fertilization. Cervical insufficiency. Otherwise " In this way of dating the pregnancy, the pregnancy is 40 weeks in duration on average instead of the actual 38 weeks. Your fundal height, which is the measurement from your pubic bone to the top of your uterus, is checked by your practitioner at each prenatal visit and helps confirm your due date.
This is the method used by "pregnancy wheels".
Due Date Calculator
If you are part of the growing tribe of IVF moms, you can calculate your due date more precisely using your IVF transfer date. The validity of gestational age estimation by menstrual dating in term, preterm and postterm gestations. Follow Us On. Placenta previa No Yes. Fitness and Health Calculators. Average Length of Cycle 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 days default One of the most important aspects of obstetrical care is to date, as precisely as possible, the beginning of pregnancy so that the estimated time of arrival ETA can be calculated sometimes referred to as the estimated date of confinement — EDC.