Information gained from exercise stress testing includes the heart rate and blood pressure response, the presence of symptoms or dysrhythmias, functional aerobic capacity and evidence of myocardial ischemia. Certain ST-segment patterns correlate with various degrees of ischemia. Overall, stress testing has a sensitivity and a specificity of about 70 and 75 percent, respectively, but the results are even more useful than this when considered in light of the pre- and post-test probability of coronary artery disease. Use of the exercise test score and decision-tree algorithms is helpful in clinical decision making.