Most sensitive sonological indicator for aneuploidy is: (A) Gestational sac volume, (B) Crown-rump length, (C) Nuchal transluscency, (D) Serum P HCG level
Answer is C. Ans. is 'c' i.e. Nuchal translucency Rumack writes - "The most effective sonographic marker of trisomy 21 and other chromosomal defects is increased nuchal translucency (NT) thickness at 11 to 14 weeks gestation."