The mean diameter cutoff for a gestational sac without an embryo had to be lengthened to 21 mm to reach a 0% false-positive rate.

When gestational and embryonic age were not considered, the yolk sac size was not significantly affected by maternal physical activity.

I had a vaginal sonar yesterday and the gine said that my gestational sac seemed too small for 5weeks 6 days (since last menstrual period) Can you tell me what the size of a gestational sac that old ...