However, the upper end of the “discriminatory zone” has continued to be used as a guideline for determining when a normal gestational sac should be visible by ultrasound. It has been generally ...

Crown-rump length is an ultrasound measurement that's used ... People with a mean gestational sac diameter (MSD) of less than 5 millimeters greater than the crown-rump length are more likely ...

Background and aims: Clinical assessment of gestational age (GA) can be challenging. Several ultrasound approaches to estimate GA using cerebellar measurements have been reported, claiming to be ...

There may be light abdominal pain and bleeding, and an ultrasound may reveal a hematoma surrounding the gestational sac. If ...

[3] Inclusion criteria were β-hCG and ultrasound performed on the same day and US result reporting no evidence of gestational sac, with subsequent documentation of a live IUP. Results were ...