I know that amnio tests are carried out at 15-16 weeks and that, unless you're in a high risk group (e.g. an older mum), you aren't offered the test automatically. But does anyone know how far in advance of the 15-16 week stage it's offered to other mums? (E.g. is it usually suggested straight after the 12 week scan?) Also, I was wondering whether all mums have the right to request an amniocentesis on the NHS, even if they aren't considered high risk? If anyone knows the answers, I'd be grateful.