A clinical study is established to determine if the results of a screening stress test can be used as a predictor of the presence of heart disease. The study enrolls 100 participants who undergo a screening stress test and then have their disease state confirmed by an angiogram (gold standard). - Twenty participants screened positive with their stress tests and had confirmed heart disease on their angiogram. - One participant who screened positive on his stress test had a normal angiogram and did not have heart disease. - Seventy-seven participants screened negative on their stress tests and had normal angiograms without heart disease.