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The Crown Rump Length (CRL) measurement in a 6 week gestation.
A mass of fetal cells, separate from the yolk sac, first becomes apparent on transvaginal ultrasound just after the 6th week of gestation. The fetal pole grows at a rate of about 1 mm a day, starting at the 6th week of gestational age.
If urinary pregnancy test is negative similar findings may suggest submucosal fibroid or retained products of conception.
The earlier in pregnancy a scan is performed, the more accurate the age assignment from crown rump length.
Gestational sac size should be determined by measuring the mean of three diameters.
The gestational sac(GS) is the earliest sonographic finding in pregnancy.
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Mean Sac Diameter measurement is used to determine gestational age before a Crown Rump length can be clearly measured.
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