Hi,My recent visit 37 weeks pregnancy came up with Pyelectasis. The prior ultrasound 13 and 20 weeks did not show anything abnormal. Blood test for DS was negative. I wonder if there is still a chance of having DS? Thank you for your answer Here is the 37 weeks ultrasound result below:Ultrasound, Ob, Trimester 3 Position: Vertex Placenta Location: Anterior Placenta Grade: 2 Afi: 14.5cm Other: EFW 3016g, 49th%tile. Bilateral Kidney pelviectasis: Rt Kidney- 1.2cm, Lt kidney 1cm (Left kidney hard to visualize due to positioning & shadowing). Bladder full & AFI WNL FHR 128 bpm