I had my 12 week scan today and had a NT measurement of 3.4mm Had bloods taken too so should get my results for chance of Downs Syndrome next week. Looking online it says the average is normally 1.5mm or something and anything above 2 is high. The sonographer told me it was slightly high but only mentioned it due to my history of my son who has Polycycstic kidneys. I'm just really worried, did anyone else have a high NT ? How did it turn out? I'm only 22 so still young.