| urinary nitrogen | Nitrogen excreted as urea, amino acids, uric acid, etc., in the urine; 1 g of urinary nitrogen indicates the breakdown in the body of 6.25 g of protein. See: nitrogen equivalent. (05 Mar 2000) |
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| filtrate nitrogen | Nonprotein nitrogen in various compounds that normally pass through the glomerular filtration, or through a filter in the laboratory (after proteins are precipitated). (05 Mar 2000) |