1. Dipstick Spot urine pH does not accurately represent 24 hour urine PH measured by an electrode
- Author
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Omar, Mohamed, Sarkissian, Carl, Jianbo, Li, Calle, Juan, and Monga, Manoj
- Subjects
Biomedical and Clinical Sciences ,Clinical Sciences ,Clinical Research ,Electrodes ,Humans ,Hydrogen-Ion Concentration ,Logistic Models ,Predictive Value of Tests ,Reference Standards ,Reference Values ,Reproducibility of Results ,Retrospective Studies ,Time Factors ,Urinalysis ,Urine ,Urolithiasis ,Urology & Nephrology - Abstract
ObjectivesTo determine whether spot urine pH measured by dipstick is an accurate representation of 24 hours urine pH measured by an electrode.Materials and methodsWe retrospectively reviewed urine pH results of patients who presented to the urology stone clinic. For each patient we recorded the most recente pH result measured by dipstick from a spot urine sample that preceded the result of a 24-hour urine pH measured by the use of a pH electrode. Patients were excluded if there was a change in medications or dietary recommendations or if the two samples were more than 4 months apart. A difference of more than 0.5 pH was considered na inaccurate result.ResultsA total 600 patients were retrospectively reviewed for the pH results. The mean difference in pH between spot urine value and the 24 hours collection values was 0.52±0.45 pH. Higher pH was associated with lower accuracy (p6.5. Samples taken more than 75 days apart had only 49% the accuracy of more recent samples (p
- Published
- 2016