booboo
No one is disputing whether a mistake was made. As I have said from my first post, yes, there has been an oversight and it shouldn't have happened
But the actual practicalities of wanting to rest for 2 out of 3 trisomies are thus:
The triple/quad test uses one blood sample and one set of results which are posted out after the test. Many posters, including you, seem to think 3 separate tests are carried out in a lab and therefore an additional test has happened. This isn't the case.
The results will be displayed as a number and then the normal range for that level. So even without wanting the interpretation of the result, it will be obvious when a result falls outside the normal range.
Secondly, this test doesn't diagnose. It indicates a risk of a potential problem. And with trisomy problems, it is rarely cut and dry at 12 weeks which problem it is.
So assuming someone who doesn't want the downs result tests high risk for something else, it doesn't mean the baby doesn't have downs. It could be Edwards or Downs. And only further tests will clarify which, if either.
Thirdly, this test is only one of a number of screenings that could pick up Downs. If you don't want the test because you definitely don't want to know either way, then what do you do at a 20 week scan?
I appreciate as a philosopher you are coming at this from a different viewpoint.
But as is very clear from your posts, you know very little about testing and are whipping this up because you know so little and are filling in the gaps.