Is a random urine ph an adequate replacement for a 24 hour urine pH?
A random urine pH should not be used to assess stone risk, because pH is too variable for a single measurement to provide meaningful information.
Urine pH in a normal subject varies from 5.0 to 7.0, depending on diet and time of day.
A 24-hour sample gives the time-averaged urine pH; normal range is 5.7 to 6.3 for a 24-hour collection.
