Doctor insights on:
Fetal Gestational Age
When a fetus is "measuring small" how is that determined? Wouldn't it just mean that the fetal / gestational age is off?
Yes and no: Yes, if the gestational dates are off. No, if they are not and the biparietal diameter of the fetus does not "measure up" to the appropriate age indicating "small for gestational age or intrauterine growth retardation.". ...Read more
I am 29 weeks pregs. Fetal gestational age is already above 31 weeks. But my uterus size is only 27-28 weeks. I hope things are normal. Pls advice?
Yes. "Accurate".: Ultrasound pregnancy dating scans measure fetal size or age (time since conception), and convert the measurements to human gestational age. Gestational age is calculated by adding 2 weeks to the age of the fetus (to the time since conception), and roughly represents the total weeks since the first day of the last menstrual period (LMP). All dates are ESTIMATES, so 7w 5d means about 7w to 8w 3d. ...Read more
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
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 moreSee 1 more doctor answer
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?
Why are fetal measurements measured by weeks plus days and not just by weeks? Are the # of days just as important to determine gestational age?
Precision: By convention gestational age is stated in weeks. For precision and accuracy weeks and days are usually indicated when specifying a gestational age. For example, some tests may be done at 15 weeks but not at 14 weeks and 6 days - so the number of days is important as well. ...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
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
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