In the early scans at 5-6 weeks just visualising a heart beating is the important thing.
Failure to identify fetal cardiac activity in a fetus whose overall length is greater than 4 mm is an ominous sign.
The GS is not identifiable until approximately 4 1/2 weeks with a transvaginal scan.
Gestational sac size should be determined by measuring the mean of three diameters.
Sometimes there is difficulty distinguishing between the maternal pulse and fetal heart beat.
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