Mean sac diameter? HELP!
Ok I am kind of worried. I'm reviewing our first ultrasound report and the mean sac diameter is 4.26 cm = gestational age of 9w5d but our crown-rump measurement was 1.83 cm = 8w4d (which is what I was expecting). Is it normal for the mean sac diameter to be tracking larger? I just read a few things that didn't sound great.
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