title: Letter: Screening test for intermittent acute porphyria.
mesh_terms: D000208:Acute Disease; D000642:Ammonia-Lyases / Q000097:blood*; D004796:Clinical Enzyme Tests; D006801:Humans; D011163:Hydroxymethylbilane Synthase / Q000097:blood*; D011164:Porphyrias / Q000175:diagnosis* / Q000201:enzymology
chemical_list: D011163:Hydroxymethylbilane Synthase; D000642:Ammonia-Lyases