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Principle: The test paper contains indicators, which clearly change colour between pH 5 and pH 9 (from orange to green to turquoise).
Evaluation: The pH value of fresh urine from healthy people varies between pH 5 and pH 6. The colour scale gives a clear distinction of pH value between pH 5 and pH 9. The pH should always be measured in fresh urine, since bacterial decomposition may increase the pH of the urine to values > 9.
Diagnosis: The pH value is only of significance in relation to other parameters. More acid urine (lower pH values) is found in case of an increased protein metabolism, high fever, serious diarrhoea and metabolic acidosis (serious form of diabetes mellitus). Alkalinity (increased pH value) may be noted in urinary tract infections, respiratory or metabolic alkalosis.
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