The aim of this study was the assessment of long-term repeatability of tilt-table test and parameters of heart rate variability analysis. Westminster protocol tilt-table test extended with nitroglycerin test was combined with analysis of heart rate variability. Five-minute intervals of ECG record were evaluated before and after the upright tilting, before syncope and 24-hour record was analysed. The test was performed in duplicate in 27 persons including 14 men (mean age 33 +/- 13.5) at interval of 29 +/- 13 months. The patients were then observed for 14 +/- 11.4 months. The study subjects were divided into groups with and without the recurrence of syncope. Repeatability was observed in 76.5% in positive test result and in 70% in negative test result. A low repeatability of positive test was observed. Blood pressure, heart rate and heart rate variability analysis parameters demonstrated a high repeatability during both tests. The recurrence of syncope was observed in 10 (37%) persons. The patients with both tilt tests positive, demonstrated recurrence of syncope two times more frequently what makes that the identification of the patients at risk for syncope return is easier.