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122813 Gynaecology & Obstetrics

A patient presents for her first initial OB visit after performing a home pregnancy test and gives a last menstrual period of about 8 weeks ago. She says she is not entirely sure of her dates, however, because she has a long history of irregular menses. Which of the following is the most accurate way of dating the pregnancy?

ADetermination of uterine size on pelvic examination
BQuantitative serum HCG level
CCrown-rump length on abdominal or vaginal ultrasound
DDetermination of progesterone level along with serum HCG level
Gynaecology & Obstetrics
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