[A method of separate determination of enzymuria associated with impairment of glomerular filtration in kidney tissue].

Possibility of separate estimation of urinary enzymes after impairment of glomerular system and kidney tissue was considered theoretically. Activities of lactate dehydrogenase, alkaline phosphatase, aminopeptidase and gamma-glutamyl transferase were studied in blood serum and urine of II patients with nephrotic syndrome (4 patients with nephrotic form of glomerulonephritis and 7 patients with mixed form of glomerulonephritis). Urinary enzymes derived from blood serum constituted 20-30% of total enzymatic activity in urine of the patients with mixed form of glomerulonephritis and it was related only to the blood serum enzymes with relatively low molecular mass and high activity (alkaline phosphatase and LDH). The results obtained are consistent with the published data showing that kidney tissue is mainly responsible for appearance of the enzymes in urine.