anuran, D”Y is in constant contact with Daas Torah and before getting back to anyone, in the event that they have to return a no, they ask what to do and it is done with the utmost care and compassion. In addition I am quite sure that if there is danger discovered in the blood they will inform the client to see a doctor.
COT, I don’t ever believe parents should meet a girl before the first date. I believe if a boy is ready for marriage he should be ready to handle the dating process himself and not rely on his parents’ opinion. Secondly, if you did that the parents could be dating as much as the boy himself.
The time to meet the parents is when the couple decide there is something there and things are coming to a decision (engagement) very soon. If the boy feels that he needs his parents permission to marry a girl and that if they say “no” he will drop her, then he and his parents need to decide at what point in the shidduch process they need to meet her. This should be relayed to the girl before she agrees to go out with him.