TABLE 4.
Results of immediate versus delayed culture of urine preserved in boric acid or refrigerateda
| Study (reference) | Preservative | Time zero storage conditions | Storage conditions for delayed culture | Positivity threshold (CFU/ml) | % sensitivity (95% CI) | % specificity (95% CI) |
|---|---|---|---|---|---|---|
| Lauer et al. (35) | GBF | Refrigeration | 18–24 h in GBF | >105 | 93 (86–97) | 100 (99–100) |
| Gillespie et al. (29) | BA | <8 h in BA | Overnight in BA | >105 | 76 (68–82) | 96 (94–97) |
| Guenther and Washington (33) | GBF | Refrigeration | 24 h in GBF | ≥105 | 87 (78–93) | ND |
| Lauer et al. (35) | Refrigeration | 18–24 h of refrigeration | >105 | 93 (86–97) | 100 (100–100) |
a
The quality rating of each study was fair. GBF, glycerol-boric acid-sodium formate; BA, boric acid; 95% CI, 95% confidence interval; ND, not determined.