1. A coronary heart disease screening system comprising: a first database including a plurality of structured computerized patient records mined, at least in part, form an unstructured data source using probabilistic inference, a first of the structured computerized patient records having patient information for a plurality of coronary risk factors for a patient; a second database including a knowledge base relating to coronary heart disease, the second database including at least one test for determining coronary heart disease risk wherein the at least one test includes a plurality of data fields relating to the coronary risk factors; and a processor for retrieving the at least one test from the second database, populating the data fields of the at least one test with patient information retrieved from the first database and calculating a risk assessment for the patient.