If the patient conceives in lactational amenorrhea, to determine the EDD, Dating scan uses ?/Best indicator of gestational age in first trimeseter is –
Correct Answer: C.R.L
Description: Ans. is 'b' i.e., C.R.L* GA in the first trimester is usually calculated from the fetal crown-rump length (CRL). This is the longest demonstrable length of the embryo or fetus, excluding the limbs and the yolk sac.* The GA estimate has a 95% confidence interval of plus or minus 6 days, and it is most accurate between 7 and 10 weeks' amenorrhea.* Fetal biometry in the second trimester can yield acceptably accurate estimates of GA from 12 to approximately 22 weeks of amenorrhea. The best parameters are the biparietal diameter (BPD) and the head circumference (HC).
Category:
Gynaecology & Obstetrics
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now