Dipstick decision rulea performance in predicting laboratory diagnosis of urinary tract infection according to European guidelines.b
| Test | |||
|---|---|---|---|
| Standard | Dipstick rule− | Dipstick rule+ | Total |
| UTI− | 108 | 46 | 154 |
| UTI+ | 58 | 196 | 254 |
| Total | 166 | 242 | |
↵a Dipstick decision rule is based on having either nitrite, or blood and leucocytes.
↵b 103 colony-forming units per ml. Dipstick negative = neither nitrite, nor leucocyte and blood combined. Sensitivity = 196/254 (77%; 95% CI = 72.0 to 82.4). Specificity = 108/154 (70%; 95% CI = 62.9 to 77.3). Positive predictive value = 196/242 (81%; 95% CI = 76.1 to 85.9). Negative predictive value 108/166 (65%, 95% = CI 57.8 to 72.4%). Likelihood ratio for a positive test = 2.58 (95% CI = 2.01 to 3.32). Likelihood ratio for a negative test = 0.33 (95% CI = 0.25 to 0.42). UTI = urinary tract infection.