Middle English (Scots) carne, from Scottish Gaelic carn; akin to Old Irish & Welsh carn cairn
Ejection fraction is commonly measured by an echocardiogram and serves as a general measure of a person's cardiac function. Ejection fraction is typically low in patients with the systolic form of congestive heart failure.
Or the HFS (Heart Falure Society}; The ejection fraction is a measurement of how well the heart is pumping. People with a healthy heart have an EF of about 60 percent, while people with heart failure have an EF of 40 percent or less. In any case the OP does not have heart failure by definition. Ejection fraction (EF): a measurement of the amount of blood pumped out of the left ventricle with each heartbeat.