On May 7, 2005, at 3:12 PM, Thomas Beale wrote:

> ...so it seems to me that the indicator of what to do next when a  
> differential diagnosis is recorded relates strongly to the innate  
> characteristics of the conditions recorded, not just the doctor's  
> opinion of how likely it might be. If angina pectoris is a possible  
> diagnosis for "burning chest pain" at 5%, with the most probable  
> diagnosis (in the opinion of the physician) being "gastric reflux"  
> at 95%, and it is a 55-yo with a family history of coronary heart  
> disease, I presume that the angina pectoris possibility is the one  
> that drives the next steps? How are the confidences really decided?

In all cases what is recorded is the personal opinion of the  
healthcare provider.
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