Test doses in extradural analgesia.
D000767:Anesthesia, Epidural / Q000379:methods; D000773:Anesthesia, Obstetrical / Q000379:methods; D000777:Anesthetics / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D011247:Pregnancy; D013997:Time Factors
D000777:Anesthetics