Create Date: October 2, 2024
Last Modified Date: December 4, 2024
Sometimes, calculating the gestational age of an unborn child can be done with the use of crown-rump length. The formula for doing so is:
Your results will clearly state the gestational age of the child based on the entered crown-rump length. For example, it will look something like 4 weeks and 6 days, making it very easy to understand and leaves the guess work out of the equation.
Using our crown-rump length tool could not be any easier. The steps involved include:
If we want to help our friend find out the gestational age of their current child we will use this tool. They recently had a crown-rump length measured to be 55 millimeters. We can enter 55 into the length field and leave the unit as millimeters. We can then hit calculate to learn that the age is about 11 weeks and 6 days.
CRL is normally around 50-55 mm at 12 weeks.
Crown-rump length is very accurate when determining gestation age for the most part. There is about a 90% confidence level that the age is within three days of the given result.
According to medical sites, if the CRL is 84 mm or more, there is a chance the child has Down Syndrome.
According to medical sites, the optimal CRL is between 45 and 84 mm at the time of birth.
