nitrogen /ni·tro·gen/ (N) (ni´tro-jen) a chemical element, at. no. 7. It forms about 78 per cent of the atmosphere and is a constituent of all proteins and nucleic acids.
nonprotein nitrogen (NPN)
nonprotein nitrogen (NPN),
nitrogen 13 a radioactive isotope of nitrogen having a half-life of 9.97 minutes and decaying by positron emission (1.190 MeV); used as a tracer in positron emission tomography.
nitrogen mustard see under mustard.
nonprotein nitrogen the nitrogenous constituents of the blood exclusive of the protein bodies, consisting of the nitrogen of urea, uric acid, creatine, creatinine, amino acids, polypeptides, and an undetermined part known as rest nitrogen.
non·pro·tein nitrogen (n n-pr  t n )n. Abbr. NPN The nitrogen content of substances other than protein in blood, tissues, and waste materials. |
nonprotein nitrogen (NPN)
[-prō′tēn]
Etymology: L, non + Gk, proteios, first rank, nitron, soda, genein, to produce
the nitrogen in the blood that is not a constituent of protein, such as the nitrogen associated with urea, uric acid, creatine, and polypeptides. Approximately one half of the nonprotein nitrogen in the blood is associated with urea.
nonprotein nitrogen (NPN),
n the nitrogen of whole blood or serum exclusive of that of the proteins. The concentration of nonprotein nitrogen is a gross measure of renal function. The upper limit of normal is 35 mg/100 ml.
nonprotein
body constituents other than proteins.
nonprotein calorie
calories provided by carbohydrates or lipids.
nonprotein nitrogen
the nitrogenous constituents of the blood exclusive of the protein bodies; abbreviated NPN. Measurement of NPN is used as a test of renal function. See also nonprotein nitrogen.
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