title: False positive test dose and epidural fentanyl.
authors: A M
authors: AM
authors: Severn
mesh_terms: D004824:Epidural Space; D005189:False Positive Reactions; D005260:Female; D005283:Fentanyl / Q000008:administration & dosage*; D006801:Humans; D007263:Infusions, Parenteral; D008012:Lidocaine; D008875:Middle Aged
chemical_list: D008012:Lidocaine; D005283:Fentanyl