Urinary pH can be measured by commercially available 'dipstix' or by using a pH meter on a fresh sample of urine. The loss of CO2 or the production of NH4 from urea-splitting organisms in infected urine will alter the pH with time. The excretion of fixed acid can be determined by the chemical titration of urine to pH 7.4, and is commonly termed 'titratable' acidity. The amount of NH4 is usually estimated from the difference between the most abundant cation (Na4, K4) and anion (Cl_) concentrations in the urine.
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