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Nitrates In Urine
In a healthy human the urinary system is sterile. The presence of bacteria in the urine (bacteriuria) indicates that the pathological process hs started. Differentiation between true bacteria and bacterial contamination in vitro causes significant difficulties. Recently proposed methods of differentiation, based on the quantification of bacteria. If the infectious process involves the kidney or urinary tract, the concentration of microorganisms is usually above 105 million in 1 ml of urine. If the urine has been infected by contact with the external part of the urethra or external genitalia, the number of microorganisms rarely exceed 104 million in 1 ml. If the urine was obtained from the bladder using a catheter, then the sample is in a healthy person should be sterile or bacteria should be less than 105 million in 1 ml of urine. Significant bacteriuria suggests cystitis or pyelonephritis, which may be caused by microorganisms, listed hematogenous route or by ascending infection.
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