[Diagnostic value of tear analysis in uremia, uricemia and cholesterolemia].

The content of urea in a tear is close to that in the blood both in health and uremia. This fact permitted development of a new method of laboratory diagnosis of uremia from the content of urea in a tear. The method may be used to diagnose uremia in renal diseases and various endogenous poisonings with clinical manifestations of renal insufficiency. A method for the diagnosis of hyperuricemia from the content of uric acid in a tear has been developed. The method was used for the diagnosis of gout and hyperuricemia in renal diseases. The suggested methods are reliable and available for common clinical biochemical laboratories. Biochemical analysis of a tear is much simpler, rapid, and atraumatic than analysis of the blood collected from the vein.