Costs and benefits were combined by the ratio cost per case detected. Cost per case detected for:
Registry cross match $56;
Questionnaire survey for tuberculosis history and symptoms $75;
Chest radiograph $956;
Tuberculin skin tests followed by radiographs for all persons with abnormal skin test results $955.
Compared to only the registry cross-match, the cross match in addition to on-site interviews cost $115 extra per extra case detected. Skin testing and radiographic screening added substantial costs without detecting additional cases.