Yolk sac is visible on USG first at
Correct Answer: Late 5th week POG
Description: yolk sac should be seen on transabdominal scanning when the mean sac diameter (MSD) is 20 mm or at a gestational age of 7 weeks and is usually seen endovaginally with an MSD of 8-10 mm or gestational age of 5.5 weeks.The gestational sac (GS) is the first sign of early pregnancy on ultrasound The threshold level identifies the earliest one can expect to see a sac (4 weeks, 3 days), and the discriminatory level identifies when one should always see the sac (5 weeks, 2 days).(Ref: Diagnostic Ultrasound by Carol M. Rumack, Stephanie R. Wilson, J. William Charboneau, and Deborah Levine,4thed, page 1079,1080)
Category:
Radiology
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