title: Letter: Pitfall in the protocol of the human placental lactogen test.
mesh_terms: D006801:Humans; D010928:Placental Lactogen / Q000032:analysis*; D011137:Polystyrenes; D011863:Radioimmunoassay / Q000295:instrumentation*
chemical_list: D011137:Polystyrenes; D010928:Placental Lactogen