A patient presents with LMP 8 weeks ago. She has history of delayed cycles in the past. Which of the following is the most accurate way of dating the pregnancy?
High-Yield Explanation
CRL is the best USG parameter to determine gestational age in first trimester Crown rump length - it is the longest straight line measurement of the embryo from the other margin of cephalic pole to rump mid-sagittal plane with fetus in neutral , non fixed position - Best seen on TVS - Overall best USG parameter to assess the fetal age - Ideal time to measures CRL is 7 - 10 weeks - can be done upto 14 weeks