Table 2.
Comparison of urine sediment results classified according to the criteria used with urine culture results according to bacterial quantification
| Sediment results |
No. of samples with urine culture resulta |
||||||||
|---|---|---|---|---|---|---|---|---|---|
| Bacteria > 10 elements/HPF (44 elements/μl) | WBC > 4 cells/HPF (18 cells/μl) | No. of samples | Negative | Polymicrobic flora ≤ 10 4^ CFU/mlb | Polymicrobic flora ≥ 10 4^ CFU/ml | ≥10 4^ CFU/ml | ≥10 ^5 CFU/ml | ≥10 ^6 CFU/ml | Yeast |
| Negative | Negative | 462 | 459 | 1 | 2 | ||||
| Positive | 52 | 42 | 1 | 1 | 4 | 2 | 2 | ||
| Positive | Negative | 267 | 169c | 37 | 8 | 5 | 7 | 39 | 2 |
| Positive | 171 | 66 | 4 | 10 | 1 | 18 | 71 | 1 | |
a
The shaded area represents the 319 false-positive samples.
b
A count for polymicrobic flora of ≤104^ CFU/ml is not clinically significant, and therefore, samples with this type of flora were considered negative by urine culture.
c
126 out of 169 urine sediment samples that were positive for bacteria, negative for WBC, and negative for bacterial growth when cultured had images without bacteria but only with debris when manual editing of the images was performed.