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| Analyte | Urinary total rifampicin concentration range (μg/mL) | Negative No. | Interference results | |||
|---|---|---|---|---|---|---|
| 1+ | 2+ | 3+ | Subtotal, n (%) | |||
| Ketones | 123–400 | 27 | 23 | – | – | 23 (85.2) |
| 150–400 | 19 | 19 | – | – | 19 (100.0) | |
| Leukocyte esterase | 131–400 | 22 | 7 | 11 | 2 | 20 (90.9) |
| 150–400 | 18 | 5 | 10 | 2 | 17 (94.4) | |
| Protein | 289–400 | 8 | – | – | 7 | 7 (87.5) |
| 300–400 | 6 | – | – | 6 | 6 (100.0) | |
| Nitrite | 346–400 | 3 | 3 | – | – | 3 (100.0) |
| 350–400 | 2 | 2 | – | – | 2 (100.0) | |
