QTc can be measured by the time between the onset of ventricular depolarization and the completion of ventricular repolarization.The normal QTC interval for a male is < or = to 430. The normal QTC interval for a female is < or = 450.The borderline QTC for a male is 431-450 and borderline QTC for a female is 451-470. The abnormal QTC range for a male is > 450 and for a female is > 470.
. http://www.fda.gov/OHRMS/DOCKETS/AC/01/slides/3746s_01_Ruskin/sld023.htm
