The residual nitrogen

The residual nitrogen - nitrogen organic compounds (with the exception of protein nitrogen and ammonia), as contained in the blood. Presents interim and final products of nitrogen metabolism, mainly urea, amino acids, uric acid, etc. is Determined released from the protein in the serum by mineralization of concentrated sulfuric acid and subsequent quantitative determination of ammonia in the resulting sulphate ammonium (see celdas method). The amount of residual nitrogen in the blood has diagnostic value. In the norm of the residual nitrogen is 20 to 40 mg%. The increase in the content of residual nitrogen in the blood occurs at infringement of function of kidneys, liver, with increased tissue destruction (gangrene, tuberculosis, malignant tumors).