At what size of mean gestational sac diameter measured on TVS with no embryonic pole is labelled as 'Anembryonic Gestation' -
An intrauterine gestational sac is reliably visualized with transvaginalsonography by 5 weeks, and an embryo with cardiac activity by 6 weeks The embryo should be visible transvaginally once the mean sac diameter hasreached 25 mm--otherwise the gestation is anembryonic. Cardiac motion isusually visible with transvaginal imaging when the embryo length reaches 5 mm.
15mm
20mm
25mm
30mm
Diagnosis of Pregnancy