Dipstick spot urine pH does not accurately represent 24 hour urine PH measured by an electrode
Int. braz. j. urol
;
42(3): 546-549, graf
Article
Dans Anglais
| LILACS
| ID: lil-785718
ABSTRACT
ABSTRACT Objectives To determine whether spot urine pH measured by dipstick is an accurate representation of 24 hours urine pH measured by an electrode. Materials and Methods We retrospectively reviewed urine pH results of patients who presented to the urology stone clinic. For each patient we recorded the most recent 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 an inaccurate result. Results A 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 (p<0.001). The accuracy of spot urine samples to predict 24-hour pH values of <5.5 was 68.9%, 68.2% for 5.5 to 6.5 and 35% for >6.5. Samples taken more than 75 days apart had only 49% the accuracy of more recent samples (p<0.002). The overall accuracy is lower than 80% (p<0.001). Influence of diurnal variation was not significant (p=0.588). Conclusions Spot urine pH by dipstick is not an accurate method for evaluation of the patients with urolithiasis. Patients with alkaline urine are more prone to error with reliance on spot urine pH.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Urine
/
Examen des urines
/
Urolithiase
/
Concentration en ions d'hydrogène
Type d'étude:
Guide de pratique
/
Étude observationnelle
/
Étude pronostique
Limites du sujet:
Humains
langue:
Anglais
Texte intégral:
Int. braz. j. urol
Thème du journal:
Urologie
Année:
2016
Type:
Article
Pays d'affiliation:
États-Unis d'Amérique
Institution/Pays d'affiliation:
Cleveland Clinic Foundation/US
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