Gynaecology & Obstetrics Which of the following is the most accurate way of dating the pregnancy? A Determination of uterine size on pelvic examination B Quantitative serum HCG level C Crown rump length on abdominal or vaginal ultrasound D Determination of progesterone level along with serum HCG level 💡 Explanation Which of the following is the most accurate way of dating the pregnancy? ✓ Correct Answer: C. Crown rump length on abdominal or vaginal ultrasound