From: Rabbi Moshe Sofer
To: Rabbi Berel
The Chasam Sofer rejects his student's novel argument combining a statistical minority with a legal presumption to permit blood from a prolapsed uterus, ruling that such analytical constructs should not serve as the basis for practical halacha. On the merits, he demonstrates that the anatomical premise fails because all relevant structures descend together during prolapse, and he advocates instead relying on the established medical testimony of the Dvar Shmuel, who confirmed the general reality of uterine prolapse. He further distinguishes that doctors are trusted regarding general medical realities but not to establish halachic certainty about a specific patient's condition.
Source: Shu"t Chasam Sofer YD §173