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how we get the EF Value THROUGH FORMULA

i want to Know about the formula of get the EF value in echo test. Whwn I have All the value of rest EF of ?
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367994 tn?1304953593
An EF is the volume of blood pumped out of the left ventricle with each heart beat.  The formula is end systolic volume subtracted from end diastolic volume divided by end diastolic volume.  
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