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Reproducibility of the measurement of ciprofloxacin concentration in bronchial mucosa.

The reproducibility of ciprofloxacin estimations was investigated in duplicate samples of bronchial mucosa from patients undergoing fibreoptic bronchoscopy. At the time of biopsy, venous blood was collected from each patient. Between 3.5 and 5.0 h after dosing, penetration (%) into the mucosa was 162.13 (S.D. 19.77). The correlation coefficient (Pearson's) between duplicate samples was 0.93. The confidence limits (95%) for a single measurement were +/- 1.47 mg/kg.