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[Differentiation of hematuria by phase contrast microscopy studies of urine erythrocytes].

The results of phase-contrast microscopic investigations of urinary erythrocytes in 300 patients (120 patients with bioptical verified glomerulonephritis, 54 patients suffering from interstitial nephritis, 56 patients with urinary tract diseases and 70 healthy probands) are discussed. The portion of glomerular erythrocytes is dependent on diuresis, renal function and activity of glomerulonephritis. This non-invasive procedure is quick and easy practicable and its results are reliable (sensitivity and specifity of more than 90%). The proof of mainly glomerular erythrocytes save from instrumental and invasive diagnostic procedures in nephrological diseases, whereas non-glomerular erythrocytes may have an urological or hematological origin.