What is Ejection Fraction?

Ejection Fraction (EF) is a vital measurement used in cardiology to determine how effectively the heart is pumping blood throughout the body. It represents the percentage of blood that is pumped out of the left ventricle (the heart's main pumping chamber) with each heartbeat. Even a healthy heart does not empty all the blood in its chambers; usually, about half to two-thirds is ejected.

How is Ejection Fraction Calculated?

The Ejection Fraction is calculated by taking the amount of blood pumped out (Stroke Volume) and dividing it by the total amount of blood in the chamber before it contracts (End-Diastolic Volume). The formula used in this calculator is:

EF (%) = [(EDV - ESV) / EDV] × 100

Where EDV is the End-Diastolic Volume and ESV is the End-Systolic Volume. Our calculator simplifies this process by providing instant results and a stroke volume calculation.

Understanding Your EF Results

According to general clinical guidelines, EF ranges are typically interpreted as follows:

• Normal (55% - 70%): The heart is pumping efficiently and delivering sufficient oxygenated blood.
• Mildly Reduced (40% - 54%): The heart's pumping ability is slightly lower than normal, which may require monitoring.
• Moderately Reduced (30% - 39%): This range often indicates heart failure or damage from a previous heart attack.
• Severely Reduced (Less than 30%): Significant impairment of heart function, requiring immediate medical attention.

Frequently Asked Questions

Can Ejection Fraction change? Yes, EF can improve with proper medication, lifestyle changes, and cardiac rehabilitation. Conversely, it can decrease due to conditions like hypertension or valve disease.

How is EF measured? EF is most commonly measured via an Echocardiogram, but it can also be assessed through Cardiac MRI, CT scans, or MUGA scans.