The reason I decided not to have the nuchal scan in the end - well, there are lots I suppose, but ultimately, we would keep the baby no matter what; I didn't want an amnio or CVS because of the risk, so a nuchal scan would only give at best some reassurrance, but may give a very unclear or 'poor' result, even if there was nothing wrong, and thus give months of needless anxiety.
Plus it only has a 90% success rate, which is obviously high, but that's still 10% of women given a clear result when in fact, there WAS a problem.
What concerns me about the tests is that so many women, usually 'strongly encouraged' by medical staff terminate pregnancies where problems have been diagnosed when in fact, they weren't that big a deal anyway, eg cleft palate. I also read one woman going on about her 'miracle baby' as she was due to have a termination following bad antenatal test result, and she couldn't turn up due to her partner having serious accident that very day, she was then too late & had to carry the baby to term. When it was born the only thing wrong was it was missing a couple of fingers, or something very minor along those lines. It really worries & upsets me, tbh, how many babies are terminated each year, not to mention those lost in the 1 - 2 % miscarriage risk. Sorry if I've upset or offended anyone, but actually I think we've gone too far in the search for a perfect race with no babies with any problems. That said, I do still feel nervous that I have rejected the tests, and now have to 'wait & see'.
Plus, my feelings on antenatal test in general aside, I also agree with www that it is outrageous that tests are offered on the NHS in some areas & not others, that the quality & price varies so much that stress, pregnant & anxious women feel forced to travel hundreds of miles & pay a lot of money to get something that down the road other women get for free. It's just not right.