Assessing the completeness of tuberculosis notification in a health district.

We have estimated the completeness of tuberculosis notification in Bolton health district by combining notification data with information from prescriptions issued by general practitioners and hospital admission data. From 1 January 1991 to 31 December 1993, 307 cases of tuberculosis were notified in Bolton. Thirty-four cases were identified using general practitioners' prescriptions: 27 of these had been notified between January 1991 and December 1993, and seven had not been notified during this period. Although prescriptions may be used as a marker for tuberculosis, they would not be an adequate alternative to notification of cases. One hundred and forty-eight cases of tuberculosis were identified between 1 October 1992 and 30 September 1993 by combining data from the three sources: 138 cases had been notified (93.2%), 28 identified from prescriptions (23.0%), and 54 identified from hospital data (36.5%).