Hashem has given us the tools to help prevent certain diseases, immense pain, and even the death of small children. If all you have to do is a small blood test, why would one put themselves and possibly their children in such a painful situation? (I have the same question about why people dont vaccinate their children, but thats another question for another time…)
One of my children is deaf. I worry about the possibility of having another child that is deaf. I worry if its genetic. I worry about a possible surgery. I worry and worry and worry. A mother never stops worrying. Why would one put themselves in the position of having such anxiety over a more serious and most of the time fatal situation?!