Met Score for Surgery: Procedure, Recovery and Results

A MET score for surgery is a measure of functional capacity—how much physical activity a person can perform—and is one part of preoperative risk assessment. It does not determine whether surgery can proceed on its own; clinicians consider symptoms, medical conditions, medications, test results and the type of operation together.

Overview: what does a MET score for surgery mean?

A MET score for surgery helps the healthcare team understand a person’s functional capacity before an operation. MET stands for metabolic equivalent of task. One MET is the approximate amount of energy the body uses at rest, while higher MET levels represent activities that require progressively more effort.

In preoperative care, METs offer a practical view of how the heart, lungs, muscles and circulation respond to everyday exertion. The score can be estimated by asking about activities such as climbing stairs, walking uphill, carrying groceries or doing household work. It may also be measured during an exercise stress test.

MET capacity is useful, but it is not a pass-or-fail test for surgery. A clinician also reviews the reason for surgery, whether it is urgent or elective, the operation’s expected physiological stress, medical history, examination findings and any active symptoms. People should not delay or cancel an operation based on a MET number without discussing it with their surgical and anaesthetic teams.

How METs are estimated before an operation

A preoperative MET score may be estimated through a focused discussion about usual physical activity. For example, basic self-care and slow walking require relatively little exertion. Brisk walking, climbing a flight of stairs, walking uphill or doing moderate housework generally requires around 4 METs or more. More vigorous activities, such as jogging or participating in demanding sports, require substantially higher MET levels.

Clinicians may use structured questionnaires, including the Duke Activity Status Index, to make this assessment more consistent. People sometimes search for a “met score surgery calculator,” but online calculators cannot replace an individual clinical review. They may not account for limitations caused by arthritis, neurological conditions, lung disease, balance difficulties or inactivity rather than heart disease.

If functional capacity is uncertain or low and the result would change management, the team may consider additional evaluation. This can include an electrocardiogram, blood tests, echocardiography, an exercise test or another cardiac assessment. Testing is not routinely needed for everyone; unnecessary testing can create delays and may not improve safety.

• About 1–3 METs: personal care, slow indoor walking and light tasks.
• About 4 METs: climbing stairs, walking up a hill, brisk walking on level ground or moderate household activity.
• More than 6–10 METs: sustained faster exercise, running or vigorous recreational activity, depending on the individual.

Is 4 METs good for surgery?

For many adults having non-cardiac surgery, an estimated functional capacity of 4 METs or greater is generally viewed as a reassuring threshold, especially when there are no active cardiac symptoms or unstable medical problems. Someone who can climb one or two flights of stairs or walk uphill without chest discomfort, unusual breathlessness or stopping may have a capacity around this level.

However, 4 METs does not guarantee that surgery is risk-free, and a value below 4 METs does not automatically mean surgery is unsafe. The significance depends on the operation and the individual. Major vascular, chest or abdominal operations may require a more detailed assessment than lower-risk procedures, while urgent surgery may proceed with tailored monitoring and risk-reduction measures.

Symptoms remain especially important. Chest pressure with activity, new shortness of breath, fainting, palpitations with dizziness or worsening leg swelling should be reported even if a person believes they can achieve 4 METs. The anaesthetist, surgeon and, when needed, cardiologist can decide whether optimisation or further assessment is appropriate.

What is a good METs score for a 65 year old?

There is no single good METs score for every 65-year-old. Functional capacity naturally varies with fitness, mobility, joint health, lung function, heart health and daily activity. A healthy and active 65-year-old may reach a high workload on exercise testing, while another person may have lower capacity because of knee pain or another non-cardiac limitation.

In a surgical setting, the most useful question is usually whether the person can perform moderate daily activity—often around 4 METs—without concerning symptoms. A score should be interpreted in context rather than compared with a younger person or with a general population average.

For older adults, preoperative planning may also include a review of frailty, nutrition, falls risk, cognitive health, independence in daily activities and medication use. These factors can influence recovery and help the care team arrange appropriate support after surgery. Improving safe activity, nutrition and control of chronic conditions before an elective operation may be beneficial when time allows.

Is a score of 10.3 METs on a stress test good?

A score of 10.3 METs on an exercise stress test usually reflects strong exercise capacity for many adults. It means the person reached a workload more than ten times resting energy use during the test. When the test is completed without concerning symptoms, abnormal rhythm changes or evidence of reduced blood flow to the heart, this result can be reassuring.

Still, the MET number is only one component of a stress-test interpretation. Clinicians also examine heart rate and blood pressure response, electrocardiogram findings, symptoms during exercise, the reason for testing and whether the person reached an adequate level of exertion. A high MET level does not independently rule out every heart or lung condition.

Before surgery, a measured result of 10.3 METs may reduce the likelihood that further cardiac testing is needed in an otherwise stable person, but decisions remain individual. The surgical team will integrate the report with the planned procedure, current health status and any changes since the test was performed.

What is the typical preoperative MET score?

There is not one typical preoperative MET score because people presenting for surgery have very different ages, diagnoses, activity levels and mobility limitations. Rather than seeking an average number, preoperative pathways often use 4 METs as a practical benchmark for moderate functional capacity.

A met score preoperative assessment may be recorded as an estimated range rather than a precise value. This is because daily activities are not laboratory measurements. A person may be able to climb stairs but stop because of hip pain, for instance, which makes it harder to judge whether the heart and lungs would tolerate greater exertion.

For elective surgery, the assessment is an opportunity to identify treatable issues such as uncontrolled blood pressure, anaemia, diabetes, smoking, sleep-disordered breathing or poorly managed heart and lung disease. Addressing these concerns can support safer anaesthesia and recovery. The planned operation should be discussed with the surgical team, including whether a structured preoperative assessment is recommended.

How the preoperative assessment and procedure process work

Preoperative assessment usually starts after surgery is being considered or scheduled. A clinician reviews the person’s diagnosis, previous operations, allergies, medications, medical history and current symptoms. They ask about functional capacity, examine the heart and lungs when indicated, and arrange tests based on the person’s health profile and the planned procedure.

For a person with adequate exercise tolerance and no warning signs, the next step may simply be routine anaesthesia planning. For someone with low or uncertain functional capacity, known cardiovascular disease or symptoms that may suggest a heart problem, the team may first optimise treatment or seek specialist advice. This approach aims to ensure that any testing or treatment has a clear purpose.

On the day of surgery, anaesthesia staff confirm the plan, monitor vital signs and tailor anaesthetic care to the procedure and patient. After surgery, recovery needs depend on the operation itself, pain control, mobility, existing conditions and any complications—not on the MET score alone. Patients should follow instructions about fasting, regular medicines, blood-thinning medicines, activity and follow-up appointments.

Benefits, limitations and when to seek medical care

The main benefit of reviewing METs is that it provides a simple, patient-centred way to assess how someone manages exertion in everyday life. It can help avoid unnecessary cardiac testing in stable people with good functional capacity and identify those who may benefit from further review. Its limitation is that the score is an estimate unless measured during formal exercise testing and can be affected by pain, disability or unfamiliarity with physical activity.

Medical care should be sought promptly for chest pain or pressure, severe or rapidly worsening shortness of breath, fainting, new confusion, blue lips, or a fast or irregular heartbeat with dizziness. Before planned surgery, patients should contact their clinician if they develop new exercise intolerance, fever or infection, worsening swelling, a recent hospital admission, or a significant change in their health.

Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals can support international patients through assessment and treatment planning when surgery is being considered. A clear discussion with the surgeon, anaesthetist and relevant specialists remains the best way to understand what an individual MET result means.

Frequently asked questions

What does MET stand for in preoperative assessment?

MET stands for metabolic equivalent of task. It compares the energy used during an activity with the energy used while resting. In preoperative assessment, it is used as an estimate of functional capacity.

Can a low MET score prevent surgery?

A low or uncertain MET score does not automatically prevent surgery. It may lead the clinical team to review symptoms, optimise medical conditions, adjust the anaesthetic plan or consider further testing if the result would affect care. The urgency and type of surgery are also important.

Do I need a stress test if I can climb stairs?

Not necessarily. The ability to climb stairs without concerning symptoms may suggest adequate functional capacity, and many people do not need routine stress testing before surgery. Testing is usually considered only when it is likely to change treatment or surgical planning.

Does a MET score measure heart health only?

No. MET capacity reflects the combined performance of the heart, lungs, muscles, joints and circulation. Pain, mobility limitations, deconditioning and neurological conditions can lower the estimate even when heart function is stable.

How can someone improve functional capacity before elective surgery?

A clinician may recommend gradual activity suited to the person’s abilities, balanced nutrition, smoking cessation and optimisation of conditions such as diabetes, anaemia, heart disease or lung disease. Any new exercise plan should be discussed with a healthcare professional, particularly when symptoms or chronic health conditions are present.

Should medications be stopped before surgery because of a MET score?

A MET score should not be used to decide whether to stop medicines. Some drugs need to be continued, adjusted or temporarily paused depending on the operation and individual health conditions. Patients should follow the instructions given by their surgeon, anaesthetist or prescribing clinician.

References

• American College of Cardiology
• American Heart Association
• European Society of Cardiology
• American Society of Anesthesiologists
• National Institute for Health and Care Excellence

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.