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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.

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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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