When correlating sac size with structures within the sac, a yolk sac was first seen in a gestational sac between 6 and 9 mm and a heartbeat seen in every patient with a 9-mm or greater gestational sac diameter.
Transvaginal sonography in the evaluation of normal early pregnancy: correlation with HCG level.
No large series has been reported with correlative data between early pregnancy findings, HCG, and gestational age.
These data allow identification of normal intrauterine pregnancy and distinction of normal from ectopic gestation at least 1 week earlier than is possible with transabdominal techniques.
The presence and size of the gestational sac, presence of normal pregnancy in the fifth through seventh weeks of gestation. We performed 75 transvaginal examinations in 53 patients with proved a yolk sac, and identification of embryonic heart activity were.