Is an Ejection Fraction of 50–55% Normal?

An ejection fraction of 50–55% is usually described as low-normal. Cleveland Clinic gives a normal range of 50% to 70%, so this result sits at the bottom of that range. Whether it matters for you depends on your symptoms, the rest of the heart scan and any earlier results.

Reference tables also differ. Cleveland Clinic's table with separate ranges for men and women lists normal as 52–72% for men and 54–74% for women, with values from 41% up to those limits described as mildly abnormal. By that table, a result of 50–51% in a man or 50–53% in a woman falls just below normal. Your own report may use different cut-offs.

This guide explains the number. It cannot tell you whether your heart is healthy or whether you need treatment.

Call your local emergency number if you have severe difficulty breathing, such as gasping or being unable to finish sentences, pale, blue or grey lips or skin, or if someone collapses and is not responding normally. Sudden chest pain also needs emergency assessment. Do not drive yourself to hospital.

Get an urgent appointment if you become breathless when lying flat or during everyday activity, cough up frothy pink phlegm, or gain weight suddenly. These are listed by the NHS as possible signs of heart failure, along with swelling in the feet, ankles, legs or abdomen and unusual tiredness after activity. Tell the team about your previous EF result, but do not let a low-normal number delay care.

Ejection fraction is the percentage of blood the left ventricle, the heart's main pumping chamber, pushes out with each beat. An EF of 55% means just over half of the blood in the chamber is pumped out; some blood always stays behind, so even a healthy heart does not reach 100%.

EF is most often measured with an echocardiogram, an ultrasound scan of the heart. It can also be measured with heart MRI, cardiac CT, nuclear scans or during cardiac catheterisation. An echo also shows the valves, the size of the chambers and how the heart walls move, and these findings help put the EF in context.

A report that reads "EF 50–55%" may give a range rather than a single figure because the estimate is not exact. Read the conclusion of the report too. A low-normal EF with otherwise normal findings reads very differently from the same EF alongside an enlarged chamber, a weak area of heart wall or a significant valve problem.

Heart failure is a clinical diagnosis, not an EF number. The ESC 2021 guideline states that diagnosis requires symptoms and/or signs of heart failure plus objective evidence of a heart problem. Only then is the EF used to describe the type. The 2022 AHA/ACC/HFSA guideline and the ESC guideline use these ranges:

• Heart failure with reduced EF (HFrEF): EF 40% or below.
• Heart failure with mildly reduced EF (HFmrEF): EF 41–49%.
• Heart failure with preserved EF (HFpEF): EF 50% or above, with further evidence such as raised filling pressures or other structural or functional changes.
• Heart failure with improved EF (HFimpEF), used by AHA/ACC/HFSA and the universal definition: a previous EF of 40% or below that has risen above 40% on follow-up.

Not by itself. An EF of 50–55% falls in the preserved range, but HFpEF is only diagnosed when there are symptoms or signs of heart failure and other evidence, such as stiff heart muscle, raised filling pressures or raised natriuretic peptide blood tests. Many people with an EF in this range have none of these.

If you do have symptoms such as breathlessness, tiredness or swelling, a preserved EF does not rule out heart failure. Cleveland Clinic notes that in HFpEF the heart pumps a normal percentage, but the chamber holds less blood, often because the muscle is thick or stiff. Other causes of breathlessness are also possible; our guide on shortness of breath with a normal chest X-ray covers that question.

The ESC heart failure guideline notes that EF measurement by echocardiography is subject to substantial variability. In practice, this means a small difference between two reports, for example 58% on one scan and 53% on the next, may not reflect a real change in the heart. Equally, a downward trend across several scans should not be dismissed as noise without a clinician looking at it.

Trends and the full picture matter more than one figure. It is reasonable to ask whether a difference is larger than expected variation, whether the same method was used, and whether anything else on the scan has changed.

If your EF was measured with a different test, such as heart MRI or a nuclear scan, the number may not be directly comparable with an echo result. Ask which test produced each figure before comparing them.

Bring this report and any earlier ones. These questions can help:

• What normal range does this report use, and where does my result sit?
• Were the heart's walls, valves, chambers and relaxation normal on the rest of the scan?
• How does this compare with my earlier results, and is any difference larger than normal variation?
• Could my symptoms, if any, be related to my heart, or should something else be checked?
• Do I need a repeat scan or other tests, such as an ECG or blood tests? If so, when?
• Which symptoms should make me seek care sooner?

On SameCase, patients and verified doctors share de-identified cases. Reading how others with a low-normal ejection fraction understood their echo report, what questions they asked and what follow-up they were offered can help you prepare for your appointment. If palpitations or an ECG finding such as right bundle branch block are also part of your story, our related guides may help.

Similar cases cannot tell you what your own EF means. Use them to prepare questions, and seek urgent care for any warning symptoms.