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If by fetal age you mean age from conception, yes they do because a pregnancy is always measured from the notional last period, even if you don't know when it was. I.e. from conception, pregnancy is 38 weeks, whereas from the LMP it is 40 weeks. An ultrasound does not add or subtarct form your due date. One method of calculating the EDC (Estimated Date of Confinement) is to calculate from the first day of the last menstrual period, since not all women ovulate on a regular basis, this is not always accurate. The ultasound calculates the EDC by measuring the size of the babies head, the bone length, crown to rump length, etc. None of these mentods can say exactly when the baby is due. Even if a woman only had sex one time and it is known exactly when she conceived, there is no guarantee she will deliver on her due date. The EDC is an estimate as to when the woman will deliver, the fetus will usually deliver within two weeks of this date.

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Q: Do ultrasounds add two weeks to your baby's fetal age?
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