Zidere V, Vigneswaran TV, Syngelaki A, et al. - This study was intended to present reference ranges for pulsed-wave Doppler flow of the mitral valve, tricuspid valve, aortic valve, and pulmonary valve, as well as heart rate, in a large number of fetuses prospectively examined at a single tertiary fetal cardiology center. In this study, researchers enrolled 7,885 fetuses at 13 to 36 weeks gestation with no detectable abnormalities from pregnancies resulting in normal live births. At the time of each assessment, the fetal heart rate was recorded. This research develops reference ranges for fetal cardiac Doppler measurements and heart rate between 13 to 36 weeks gestation that may be beneficial in clinical practice.