MomX4 in some cases this makes sense, say a couple who needs to make life decisions, but there are other minimally invasive and low risk tests with good confidence level, one can e.g. seek foetal cells in maternal bloodstream, which together with an accurate ecography (with a well-calibrated machine) and tri-test or 4-test are pretty reliable. Rabbi Moshe was niftar before the latest advancements in medicine and there are options he did not know about. These tests should actually be offered before amniocentesis or villocentesis, because a biased sample causes many false positives and false negatives, but unfortunately, this does not always happen.
However, in most cases it makes little or no sense to know in advance, it’s just extra heartache and stress, and also, there are many potential problems and only few can be diagnosed even with invasive exams such as amniocentesis and villocentesis. Also, for Down Syndrome there’s no reason to give birth in a hospital with NICU. If a person feels safer in giving birth close to a NICU, they should just plan to go to a larger hospital. Peace of mind is important and helps with an easy birth.