Diane, dun be confused..
this is wat i thk lah >> once he did a normal scan at his clinic show the neck thickness is normal then u dun have to go TMC do NTscan, can direct do OSCAR. for my case, like wat other mummy said, the % between OSCAR & NTscan just diff 5% so even after do NTscan then do OSCAR again ll get the same result and only is the high risk then must go amnio again. so he direct ask me skip OSCAR.
i dun dare to call him ask these thing le, he always seem so busy de. when u call is he pick the phone or the nurse? if the nurse then u ask pass to Dr Ang huh?