R. Moshe Feinstein on Practicing Medicine on Shabbat (17 Adar)

שו"ת אגרות משה אורח חיים ד:עט 17 Adar 5739 (1979)

Rav Moshe responds to a recent medical school graduate who is about to enter residency about issues of practicing medicine on Shabbat. He emphasizes that pikuach nefesh (saving a life) is docheh (pushes aside) Shabbat, it doesn't suspend Shabbos completely.