US provides subtle clues aiding ectopic evaluation.
Yee
B
B
University of California at Irvine.
D015415:Biomarkers / Q000097:blood; D006063:Chorionic Gonadotropin / Q000097:blood; D005260:Female; D006801:Humans; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000097:blood / Q000000981:diagnostic imaging*; D016216:Ultrasonography, Prenatal / Q000295:instrumentation