Given an end-systolic volume of 100 mL and an end-diastolic volume of 190 mL, what is the ejection fraction in percent?

• A. 47%
• B. 53%
• C. 38%
• D. 60%

Answer: (A)

Ejection fraction tells you what fraction of blood in the ventricle at the start of contraction is actually pumped out during systole. It’s calculated as (EDV minus ESV) divided by EDV, times 100.

Here, stroke volume = EDV − ESV = 190 mL − 100 mL = 90 mL. EF = 90 / 190 × 100 ≈ 47%.

So about 47% of the filled ventricle is ejected. This is below the typical normal range (roughly 55–70%), indicating reduced systolic function.