World Journal of Nephrology and Urology, ISSN 1927-1239 print, 1927-1247 online, Open Access
Article copyright, the authors; Journal compilation copyright, World J Nephrol Urol and Elmer Press Inc
Journal website http://www.wjnu.org

Original Article

Volume 4, Number 1, March 2015, pages 169-172


Does 24-Hour Urine Supersaturation Predict Stone Composition?

Figure

Figure 1.
Figure 1. Accuracy of supersaturation at different cut-off values of predominant stone composition.

Tables

Table 1. Bivariate Comparison of 24-Hour Urine Elements Across Stone Type Groups
 
DemographicsCAOXCAPHUAMixedP value
*Stone group: ≥ 60% of the predominant mineral.
No. of patients (%)235 (61%)98 (25%)35 (9%)18 (5%)386
Gender< 0.0001
  Male151 (64%)31 (32%)24 (69%)10 (56%)
  Female84 (36%)67 (68%)11 (31%)8 (44%)386
Mean age56 ± 1554 ± 1760 ± 1050 ± 140.390
BMI29 ± 7.529.3 ± 9.331.2 ± 6.430.5 ± 7.40.3781
pH5.9 ± 0.46.4 ± 0.65.8 ± 0.66.4 ± 0.6< 0.0001
Urine volume2 ± 0.92.1 ± 11.9 ± 0.81.9 ± 10.6195
CAOX SS6.74 ± 3.66.6 ± 3.75.9 ± 3.75.6 ± 3.20.3202
CAPH SS1 ± 0.961.6 ± 1.20.7 ± 1.11.5 ± 1.2< 0.0001
UA SS1 ± 0.870.46 ± 0.51.4 ± 10.5 ± 0.87< 0.0001

 

Table 2. Accuracy of Supersaturation at Different Cut-Off Values of Predominant Stone
 
Mineral stone conc.* (%)Calcium oxalate (sensitivity/specificity/accuracy)Calcium phosphate (sensitivity/specificity/accuracy)Uric acid (sensitivity/specificity/ accuracy)
*Conc.: concentration.
> 60%54%/51%/52.5%32%/83%/70%60%/67.5%/67%
> 70%55%/50%/54%32%/82.5%/72%60%/67.5%/67%
> 80%55%/52%/54%38%/83%/76%60%/67%/67%
> 90%51%/48%/49%40%/82%/77%60%/67%/67%