Diagnosis of Down syndrome at 11 weeks is best assessed by:: (A) Ultrasonography, (B) Aminocentesis, (C) Chronic villous biopsy, (D) Dopper Ultrasound
Answer is C. Confirmatory test for Down's syndrome: 1. First trimester- Chorionic villous sampling(10-13th week) 2. Second trimester - Amniocentesis(16-18th week)