The aim of the study was to evaluate changes of ventricular repolarization variables during the exercise test in women with coronary heart disease, to determine variables, which can best predict significant coronary artery stenoses, and to improve noninvasive diagnostics of coronary heart disease. Ninety women with unstable angina pectoris undergone coronary artery angiography and exercise test on 4th-6th day of hospitalization at Kaunas University of Medicine Hospital. There was no difference in ventricular repolarization variables (JT interval, JT dispersion, JT and ST product) in women without coronary artery stenoses and those with one or two coronary artery stenoses. Sensitivity (87%), specificity (60%), positive predictive (43%), negative predictive (93%) and diagnostic value (67%) of stress test variable, which had no correlation with heart rate -ST and JT product- was greater comparing with ST depression greater than 0.1 mV (values respectively 61%, 49%, 29%, 79%, 52%). JT dispersion at the peak of exercise greater than 33 ms had the best diagnostic value (77%). The most accurate predictors of three-vessel disease are JT dispersion, ST and JT product at the peak of exercise and the fact of previous MI: JT dispersion at the peak of exercise more than 33 ms significantly increases three-vessel disease odds ratio 7.95 times. ST and JT product greater than 22,38 mV x ms significantly increases three-vessel disease odds ratio 13.9 times. The fact of previous MI significantly increases three-vessel disease odds ratio 6.85 times.