What's a normal ef on an echo for a 19 year old?

Over 55%: Normal ejection fraction of the left pumping chamber while at rest is over 55%. Other important parameters to look at on echocardiography include movement of different heart muscle segments, size and thickness of various heart chambers, function of the right ventricle, valve function, congenital heart defects and signs of high pressures and stiffness in the heart muscle.