RT Journal Article SR Electronic T1 The medical history as a diagnostic technology JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 273 OP 276 DO 10.3399/bjgp08X279779 VO 58 IS 549 A1 Nick Summerton YR 2008 UL http://bjgp.org/content/58/549/273.abstract AB The medical history is a powerful diagnostic technology. However, in seeking to establish an appropriate balance between the history and the other diagnostic modalities more explicit consideration must be given to the performance characteristics of the medical history. Building on recent work undertaken in the UK and elsewhere in Europe it is now feasible to develop a library of setting-specific likelihood ratios and κ statistics for key elements of the medical history. Of particular importance to those working in primary care, statistically adjusted combinations of information from the medical history can be generated; furnishing clinicians with likelihood ratios of significant magnitudes. It is suggested that developing a more rational approach to the use of the medical history could lead to improvements in diagnostic efficiency and effectiveness, with benefits for individual patient care in addition to the overall NHS budget. When diagnosis is viewed as a processing pathway founded on a robust medical history, it becomes clear than in some situations investigations may become unnecessary and, in other circumstances, their impact will be enhanced.