Table 1 Comparison of Sysmex UF‐100 flow cytometer and bacterial culture results using variable bacterial counts as the cut‐off values.
| Cut‐off value (number of bacteria/μl) | ||||||||
|---|---|---|---|---|---|---|---|---|
| 8000 | 7000 | 6000 | 5000 | 4 000 | 3 000 | 2 000 | 1 000 | |
| Number of culture positive/Sysmex positive | 265 | 268 | 269 | 275 | 281 | 290 | 297 | 304 |
| Number of culture negative/Sysmex positive | 162 | 176 | 198 | 223 | 263 | 316 | 420 | 591 |
| Number of culture negative/Sysmex negative | 537 | 523 | 501 | 476 | 436 | 383 | 279 | 108 |
| Number of culture positive/Sysmex negative | 41 | 38 | 37 | 31 | 25 | 16 | 9 | 2 |
| Sensitivity | 86 | 87 | 88 | 90 | 92 | 92 | 97 | 99 |
| Specificity | 77 | 75 | 72 | 68 | 62 | 55 | 40 | 15 |
| Positive predictive value | 62 | 60 | 56 | 55 | 52 | 47 | 41 | 34 |
| Negative Predictive value | 93 | 93 | 93 | 94 | 94 | 96 | 97 | 98 |
| Number of urine samples flagged for culture, total (%) | 427 (42) | 444 (44) | 467 (46) | 498 (49) | 544 (54) | 606 (60) | 717 (71) | 895 (89) |