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 ...

[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 ...

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 ...

If you're less than five or six weeks pregnant, it's unlikely to find a heartbeat by ultrasound. For this reason, many providers won't see pregnant patients until they've passed this gestational age.

The frequency dependence of attenuation of broadband ultrasound and the velocity of ... study was to see how BUAC and velocity change with gestational age (GA) and postnatal age (PNA).

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 ...