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| Analyte | Urinary total rifampicin concentration range (μg/mL) | Negative No. | Interference results | |||
|---|---|---|---|---|---|---|
| ± | 1+ | 2+ | Subtotal, n (%) | |||
| Protein | 219–400 | 18 | 9 | 7 | – | 16 (88.9) |
| 250–400 | 13 | 8 | 5 | – | 13 (100.0) | |
| Leukocyte esterase | 267–400 | 9 | – | 6 | 1 | 7 (77.8) |
| 300–400 | 4 | – | 3 | 1 | 4 (100.0) | |
