title: Fetal calf serum as a cause of false positive amniotic fluid acetylcholinesterase gel tests.
mesh_terms: D000110:Acetylcholinesterase / Q000032:analysis*; D000653:Amniotic Fluid / Q000201:enzymology*; D001769:Blood; D003470:Culture Media; D004587:Electrophoresis, Agar Gel; D005189:False Positive Reactions; D006801:Humans
chemical_list: D003470:Culture Media; D000110:Acetylcholinesterase