All of the following are commonly used for estimation of gestational age in mid trimester EXCEPT: March 2013: (A) Biparietal diameter, (B) Crown Rump Length, (C) Abdominal circumference of fetus, (D) Femur length
Answer is B. Ans. B i.e. Crown Rump Length CRL is most accurate with an error of 2.1 days in the first trimester BPD, FL, HC (head circumference) & AC is commonly used for dating thereafter.