Episode 24 - First Trimester Pregnancy Emergencies: Recognition and Management
EB Medicine
JANUARY 2, 2019
So to get us all on the same page, the discriminatory zone is the b-HCG at which an IUP is expected to be seen on ultrasound. This corresponds nicely to a 2013 retrospective study demonstrating a bHCG threshold for the fetal pole to be just below 1400. For a threatened abortion, the os would be closed with an IUP seen on ultrasound.
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