Dating ultrasound at 8 weeks

Posted by / 20-Dec-2015 20:11

Dating ultrasound at 8 weeks

Most babies, except in cases of early IUGR and deformities, grow about the same until 20 weeks or so.After that, the variations among babies’ measurements cause increasing inaccuracies.When an ultrasound is performed, measurements of the head, abdomen, thigh, and amount of amniotic fluid are done.These measurements are computed automatically in the ultrasound machine’s software.The software has certain measurement scales based on data from large populations, and your baby’s measurements are put into this scale.In other words, by comparing your baby’s measurements to the data from this large collection of measurements, the ultrasound can then tell how far along your baby is.The femur (thigh bone) length seems to hold on to it’s accuracy longer than the other parameters, but after 36 weeks it isn’t foolproof.Two ultrasounds taken one month apart that agree with each other on when the due date is, yield a very accurate and reliable answer.

Use a Facebook account to add a comment, subject to Facebook's Terms of Service and Privacy Policy.Every pregnancy is, of course, unique in its development, and each woman’s prenatal care will vary.For these reasons, each woman is likely to see or hear her baby’s heartbeat at different stages in her pregnancy.Ultrasound has become so helpful that obstetricians now refer to the time before it was used routinely as “the olden days.” We use it to diagnose twins early on; we use it to document appropriate growth as the pregnancy progresses; we use it to determine fetal health; and we use it to guide conversion of breech to vertex (head-first) position and to guide amniocentesis.Of all of these uses, dating the pregnancy is the most common reason to use ultrasound, particularly when the expectant mother cannot remember the date of her last period (as in breast-feeding or irregular cycles).

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