Journal of clinical pathology
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To determine the cost and sensitivity of sputum cytology in routine use and to determine when sputum cytology is most appropriate. ⋯ Often sputum cytology is used inappropriately as a screening investigation on, or soon after, admission. In addition, it is used inappropriately before bronchoscopy. Sputum cytology should be limited to individuals in whom a histological diagnosis is desired, but in whom bronchoscopy is inappropriate or unsuccessful.