title: The rectal and oral arterial ammonia tests: a comparison.
mesh_terms: D000284:Administration, Oral; D000641:Ammonia / Q000097:blood*; D004733:Enema; D006801:Humans; D000644:Quaternary Ammonium Compounds / Q000008:administration & dosage*; D013223:Statistics as Topic
chemical_list: D000644:Quaternary Ammonium Compounds; D000641:Ammonia