Urinary excretion of lysozyme and N-acetyl-beta-D-glucosaminidase in the diagnosis of renal allograft rejection.

The urinary excretion of N-acetyl-beta-D-glucosaminidase (NAG) has been claimed to be of high diagnostic value in indicating acute renal graft rejection. Similar claims have been made for the significance of urinary lysozyme excretion. Serial measurements of urinary lysozyme and NAG have been made in 35 patients after renal transplantation, and during 52 suspected rejection episodes. A close correlation has been found between these two parameters although they did not consistently change in parallel. The use of both assays may give a better indication of impending rejection than either assay alone.