Table 2.
Test characteristics of preoperative voided via Ctx or NGS technique relative to intraoperative Stone culture (primary outcomes). Concordance defined as cultures are either both positive, or both negative for any microorganism.
| Characteristic | Technique | Intraoperative Stone culture | ||
|---|---|---|---|---|
| Ctx | NGS | |||
| Preoperative Voided | Sensitivity | Ctx | 66.7 | 47.5 |
| Specificity | 73.7 | 68.2 | ||
| PPV | 54.5 | 57.6 | ||
| NPV | 82.4 | 58.8 | ||
| Sensitivity | NGS | 85.2 | 90.0 | |
| Specificity | 24.6 | 31.8 | ||
| PPV | 34.8 | 54.5 | ||
| NPV | 77.8 | 77.8 | ||
Ctx, standard culture; NGS, next generation sequencing; NPV, negative predictive value; PPV, positive predictive value; Stone, renal stone; Voided, voided bladder urine.