Doctor insights on:
Gestational Age Vs Fetal Age
Minor: Gestational age refers to the length of time since the first day of your last period. Fetal age refers to the age of your developing baby, counting from the estimated date of conception. ...Read more
With an ultrasoundn is fetal age always 2 weeks smaller then gestational age? What about if you have irreg cycles? Are these taken into consideration
No: Ultrasounds determine actual measurements but its measurement is not different from that by last menstrual period. If there is 2 week difference it may be acceptable in late pregnancy since ultrasound measurements lose precision later in pregnancy. Early pregnancy ultrasounds if done correctly are very accurate and 2 week difference may be related to uncertain period date. ...Read more
Gestational age.: All obstetrical care by convention is based on estimated gestational age (ega) - not actual embryonic/fetal age. A first trimester ultrasound can pinpoint your due date with great accuracy. ...Read more
Why are fetuses measured by gestational age and not by the actual fetal age? So if u are 12wks the measurements are actually of a 10 week old fetus?
Math: Gestational age is based on your last period..The best way we can estimate fetal age....After doing thousands of measurements standards have emerged...So if you are 12 weeks and the baby is 10 weeks in size, it would indicate a smaller baby at this time...Just a way to follow growth of the baby. If I am off, i hope an OB wills set the record straight. ...Read more
Likely gestational: Most of the time pregnancy is described in terms of gestational age. This is of historical relevance because prior to the invention of imaging technologies the most reliable mark of timing of pregnancy was the first day of the last menses. Ovulation occurs 14 days thereafter on the average. So fetal age is two weeks less than the menstrual or gestational age. ...Read more
Both: Fetal age is of course the exact age of your fetus as determined by measurements taken of the baby. Fetuses have different rates of growth or may have problems with growth, so sometimes the measurement age doesn't match the "expected" gestational age. The best "age" is determined by an early ultrasound between 6 and 12 weeks gestation. Accuracy of ultrasound decreases as pregnancy progresses. ...Read more
I was told a baby's heartbeat doesn't beat until 5 weeks, is that 5 weeks gestation or fetal age? and how likely is it to see heartbeat at 5w 4d?
Should your fundal height measure to gestational age or fetal age? I.E. If 25 weeks from LMP should it be 25cm?
How could warfarin effect an embryo that is 2 weeks old in fetal age (4 weeks gestational)? There isn't even a placenta yet
Great question: This assumes that you know exactly when you conceived. We see women all the time who have incorrect dates based on irregular timing of ovulation, conception and implantation. The fact is, warfarin is 'teratogenic' in the first trimester. Why would you take this risk? Talk to an mfm specialist. ...Read more