A patient present for her first antenatal 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?
Dating of pregnancy crown rump length is measured from the top of the head to the bottom of the buttocks excluding limbs CRL between 9 and 11 weeks is the most accurate method of dating CRL in cm + 6.5 gives a rough estimate of gestational age in weeks refer pgno:476 Sheila textbook of obstetrics 2 nd edition
Determination of uterine size on pelvic examination
Quantitative serum hCG levels
Crown rump length on transabdominal or transvaginal ultrasonography
Determination of progesterone level along with serum hCG level
Diagnosis in obstetrics