[Microscopic hematuria].
Isolated microhematuria, without any other systemic and local causes, is frequent phenomenon in clinical practice. It is a diagnostic problem for both general practitioners and nephrologists. By means of standard diagnostic procedures it is usually very hard to define nature and origin of blood in urine. Therefore, in those cases invasive diagnostic methods of examination are usually applied, cystoscopy, invasive radiology etc. Light microscopy and supravital coloring secure high-quality approach to various elements formed in urine's sediment. They also provide better analysis of the morphology of erythrocytes. It is of great importance to define their origins. Using verified methodological principles, this method attains its real place in diagnostic procedures applied to examine the origins of blood in urine.