title: Calculating nitrogen balance from urine samples collected over six hours.
mesh_terms: D006801:Humans; D009584:Nitrogen / Q000378:metabolism / Q000652:urine*; D010289:Parenteral Nutrition, Total; D013997:Time Factors; D014508:Urea / Q000652:urine
chemical_list: D014508:Urea; D009584:Nitrogen