Pulmonary artery pressure is the blood pressure inside the arteries that carry blood from your heart to your lungs. On an echocardiogram, a normal estimated pulmonary artery systolic pressure (PASP) is below 35 mmHg. Higher readings are a signal your cardiologist uses to screen for pulmonary hypertension and to decide whether more testing is needed.
What is pulmonary artery pressure?
The right side of your heart pumps blood into the pulmonary artery, which delivers it to the lungs to pick up oxygen. Pulmonary artery pressure describes how much force that blood exerts on the artery walls. Unlike the arm blood pressure you may know (which reflects the systemic circulation), pulmonary pressure reflects the lung circulation, which normally runs at much lower pressures.
Most often the number you see is an estimate. During a routine echocardiogram (a heart ultrasound), the sonographer measures the speed of a small jet of blood that leaks backward across the tricuspid valve. Using that velocity, the software calculates the pulmonary artery systolic pressure (PASP) in millimetres of mercury (mmHg). The only way to measure pulmonary pressure directly is right heart catheterisation, an invasive procedure done in a cardiology lab. This is why an echo result is a screening estimate, not a final diagnosis.
Pulmonary pressure matters because a sustained rise strains the right ventricle. Over time this can lead to breathlessness, reduced exercise capacity, and, if untreated, right heart failure. Catching a raised reading early lets your doctor find and treat the underlying cause. For more on how vital signs and imaging fit together, see the Vitals & Imaging hub.
Pulmonary artery pressure normal range
For an echo-estimated PASP, a value under 35 mmHg is considered normal. As the number rises, the concern for pulmonary hypertension increases. The bands below reflect the tiers used in ExaHealth's clinical reference ranges, aligned with ESC/ERS pulmonary hypertension guidance for echo-estimated PASP.
| Estimated PASP (mmHg) | Category |
|---|---|
| Below 35 | Normal |
| 35 to 49.9 | Borderline / mildly elevated |
| 50 to 69.9 | Moderately elevated |
| 70 and above | Severely elevated |
A few practical points for readers in India and elsewhere. Echo estimates depend on getting a clear signal across the tricuspid valve; if the jet is weak or absent, the lab may report the pressure as "unable to estimate" rather than give a false-normal number. Reports from different Indian labs may phrase the finding as "RVSP" (right ventricular systolic pressure), which is the same value when there is no obstruction between the right ventricle and pulmonary artery. Always read the pressure alongside the rest of the echo, including right heart size and function, which your cardiologist interprets together.
Normal range by age, sex and measurement conditions
The RANGE DATA for echo-estimated PASP provides a single default set of bands rather than separate numbers by age or sex, so the table above applies broadly to adults. That said, several real-world factors shift where a person falls, and understanding them helps you read your report sensibly.
| Modifier | Why the estimate can differ |
|---|---|
| Age | Pulmonary pressure tends to drift slightly upward with age as arteries stiffen, so an estimate at the higher end of normal can be more common in older adults. |
| Altitude | Living at high altitude, such as in parts of the Himalayas, can raise pulmonary pressure because lower oxygen tightens lung vessels. |
| Exercise and activity | Pressure rises transiently during exertion; a resting echo is the standard for these bands. |
| Body build and lung disease | Chronic lung conditions and sleep-disordered breathing can elevate pressure, while a poor acoustic window can make the estimate less reliable. |
Because these are qualitative modifiers, do not adjust your own number by them. Bring the context (your age, where you live, any breathing problems) to your cardiologist, who weighs it against the measured value.
What a high pulmonary artery pressure means
Pulmonary hypertension is broadly defined as an abnormally high pressure in the pulmonary arteries. On echo, an estimated PASP of 35 mmHg or higher prompts a closer look. In the tiers above, 35 to 49.9 mmHg is mildly elevated, 50 to 69.9 mmHg is moderate, and 70 mmHg or higher is severe.
A raised pulmonary pressure is a finding, not a single disease. Common contributors your doctor will consider include:
- Left heart problems such as heart failure or valve disease, which back pressure into the lungs. This is one of the most frequent causes.
- Chronic lung disease like COPD, interstitial lung disease, or long-standing severe asthma.
- Blood clots in the lungs (chronic thromboembolic disease).
- Pulmonary arterial disease, a less common group of conditions affecting the small lung arteries directly.
- Sleep apnoea and high-altitude living, which lower oxygen and constrict lung vessels.
Symptoms that can accompany a genuinely elevated pressure include breathlessness on exertion, fatigue, chest discomfort, light-headedness, and swelling in the legs. If your echo shows a raised number, the usual next steps are a right heart catheterisation to confirm the pressure and tests to find the cause. Related screening metrics like SpO2 oxygen saturation and your resting heart rate often form part of that wider picture.
What a low pulmonary artery pressure means
Unlike arm blood pressure, a low pulmonary artery pressure is not a recognised disease on its own, and this metric is mainly a one-sided concern about pressures being too high. A value comfortably below 35 mmHg is reassuring and is what you want to see on a report.
Occasionally a very low or unmeasurable estimate simply reflects a technical limitation: if the tricuspid valve leak is minimal, there may be too little signal to calculate a pressure. In that case the report may say the pressure could not be estimated. This is not the same as a low pressure and is not itself worrying; your cardiologist will judge whether the rest of the echo is normal.
How to improve pulmonary pressure and when to see a doctor
You cannot change a pulmonary pressure reading through willpower, and no home remedy lowers it directly. What helps is addressing the conditions that drive it up, always guided by a clinician:
- Treat the underlying cause. Managing heart failure, valve disease, COPD, or sleep apnoea is the core of lowering pulmonary pressure.
- Keep oxygen levels healthy. If you have a lung condition or live at altitude, follow your doctor's advice on oxygen and monitoring.
- Stay active within safe limits and maintain a healthy weight, as your cardiologist advises.
- Avoid smoking and manage blood pressure and diabetes, which protect both heart and lungs.
When to see a doctor: if your echo report shows an estimated PASP of 35 mmHg or more, or if you have unexplained breathlessness, fainting, chest pain, or leg swelling, arrange a review with a cardiologist. Bring the full echo report, not just the pressure number. Tracking your everyday vitals over time, alongside tools like ExaHealth, can help you and your doctor spot trends worth discussing.
Guidelines and references
The pressure bands used here follow the echo-estimated PASP thresholds in ExaHealth's clinical reference ranges, aligned with pulmonary hypertension guidance from the following bodies. Links go to each organisation's official homepage only.
- European Society of Cardiology (ESC) — https://www.escardio.org
- European Respiratory Society (ERS) — https://www.ersnet.org
Frequently asked questions
What is a normal pulmonary artery pressure on an echo?
A normal echo-estimated pulmonary artery systolic pressure (PASP) is below 35 mmHg. Readings of 35 mmHg or higher prompt your cardiologist to screen for pulmonary hypertension.
Is echo-estimated pulmonary pressure the same as a direct measurement?
No. Echo gives an estimate based on the speed of a small valve leak. The only direct measurement is right heart catheterisation, which is used to confirm pulmonary hypertension when the echo is abnormal.
What does a PASP of 50 mmHg mean?
An estimated PASP of 50 to 69.9 mmHg is moderately elevated. It suggests pulmonary hypertension and warrants further evaluation by a cardiologist to confirm the pressure and find the cause.
Can my pulmonary artery pressure be too low?
A low pulmonary pressure is not a recognised condition on its own, and a value well under 35 mmHg is reassuring. Sometimes a pressure simply cannot be estimated on echo due to a weak signal, which is a technical limitation rather than a low reading.
Why is my pulmonary pressure higher living at high altitude?
Lower oxygen at high altitude causes the small lung arteries to tighten, which can raise pulmonary pressure. Mention where you live to your cardiologist so it can be factored into your report.
What should I do if my echo shows high pulmonary pressure?
See a cardiologist with your full echo report. They may arrange further tests, including right heart catheterisation, to confirm the pressure and identify the underlying cause before any treatment.