[Enzymuria in chronic nephropathies. Diagnosis by the urinary enzyme method in chronic nephropathies].

A simple empirical method based on linear relation-ships between certain types of enzymuria (NAG, LDH, GRS, Isoenzymes I and V of total dehydrogenase lactate) has been used in a series of 80 patients presenting chronic nephropathy [40 interstitial nephropathy (IN) and 40 glomerulonephritis (GN)]. Diagnosis made on the basis of the results obtained in each case was identical to that based on clinical findings (in the absence of enzymuria determinations). This method, if confirmed on a larger number of statistically significant data, might be useful to obtain a differential diagnosis between I.N. and G.N. only assaying these few enzymurias. Prefixed relationships could be employed on a larger group of patients with other diseases studied for comparative purposes. Furthermore, this method appears to be fast and unexpensive.