The NASA Lean Test at Home: How to Do It Safely and What to Write Down

The NASA lean test is a simple way to see what happens to your heart rate and blood pressure when you stay upright for ten minutes, and it needs nothing more than a wall, a cuff and a helper. Here is how to do it safely at home, what to record at each minute, how clinicians read the numbers, and what the test can and cannot tell you.

What the NASA lean test is, and what it is not

The test grew out of NASA research on how the body handles being upright, and it was adapted for patients by clinicians at the Bateman Horne Center, which recommends it for people with ME/CFS and fibromyalgia as a practical way to look for orthostatic intolerance. Leaning lightly against a wall takes away some of the muscle work of standing, so blood pools more like it does on a tilt table, without needing one.

It is important to be clear about its limits. A 2025 letter in Clinical Autonomic Research from a group of autonomic specialists pointed out that the lean test has not been properly validated against tilt table or standard active stand testing, and argued that it should not be used on its own to diagnose anything. Many clinicians still find it a useful screen. Both things can be true: it is a good way to gather evidence, and a poor way to reach a conclusion.

Before you start: safety first

The lean test asks your body to do the very thing it struggles with. Take these seriously:

• Never do it alone. You need a helper to take blood pressure readings and to catch you if you become faint. The Bateman Horne Center’s clinician instructions use two observers for exactly this reason.
• Clear the space. Have a bed, couch or chair right beside you, and nothing hard or sharp nearby.
• Stop if you feel faint. Lie down and raise your legs. The test is over; the information you already have is enough.
• Do not change your medications for a home test. Clinic protocols sometimes pause medications that affect heart rate or blood pressure, but only under medical supervision. At home, take your usual medications and write down what you took and when.
• Ask first if you have heart disease or a history of fainting with injury. In that case, talk to your clinician before trying this at home, or do it in a clinic.

What you need

• A validated upper-arm blood pressure cuff. Wrist cuffs are less reliable, especially when you are upright.
• A heart rate source. The cuff will give a heart rate, but a chest strap, watch or finger pulse oximeter lets your helper read it quickly every minute.
• A wall, a timer and a log. Use the log table below, a notebook, or an app.
• A helper. One person can do it; two is better, one to measure and one to write.

Pick a quiet time and keep the conditions similar each time you repeat it. Many people find mornings show the strongest response, and a consistent time of day makes later tests comparable.

How to do the test, step by step

1. Lie down and let your readings settle

Lie flat in a quiet room. The Bateman Horne Center protocol uses 15 to 20 minutes of rest before measuring. Then take your blood pressure and heart rate, wait one minute, and take them again. If the two sets are noticeably different, keep measuring a minute apart until two in a row agree. Their average is your lying baseline.

2. Stand and lean

Sit up on the edge of the bed for a moment, then stand and lean back against the wall. Only your shoulder blades should touch the wall, with your heels about 6 inches (15 cm) away from it. Let your arms hang loosely and keep the cuff arm relaxed and supported.

3. Stay still for ten minutes

Start the timer as soon as you are leaning. Try not to shift your weight, tense your legs, fidget or talk, except to report how you feel. Leg movement and muscle tensing push blood back toward the heart and can hide the response the test is looking for. (Outside a test, those same moves are useful; see the piece on counterpressure maneuvers.)

4. Record every minute

At minute 0 and then every minute through minute 10, your helper records heart rate and blood pressure. They should also note your symptoms, any change in skin color in your feet and legs (a reddish purple color is common in orthostatic intolerance), and whether you seem foggy or slow to answer.

5. Lie down and recover

When the ten minutes are up, or sooner if you feel faint, lie down. Rest as long as you need. Some people feel washed out for the rest of the day, so plan nothing demanding afterwards.

What to write down

Copy this table into a notebook or print it. Fill in one row per minute.

At the top of the page, also note the date and time, what you ate and drank, your medications and when you took them, how you slept, and anything unusual such as a hot day or a recent crash. Context is what turns a set of numbers into something a clinician can interpret.

How clinicians read the results

These are the reference points used in clinical practice. They are here to help you understand your log, not to diagnose yourself.

The POTS pattern

A 2022 review in the Canadian Medical Association Journal summarizes the diagnostic criteria for POTS as a sustained heart rate increase of at least 30 beats per minute within 10 minutes of being upright (at least 40 for ages 12 to 19), seen in at least two readings a minute or more apart, without significant orthostatic hypotension. The criteria also require frequent symptoms on standing for at least three months and no other condition that better explains the fast heart rate.

The orthostatic hypotension pattern

A sustained drop of 20 mmHg or more in systolic pressure, or 10 mmHg or more in diastolic pressure, within three minutes of standing points toward orthostatic hypotension, which is a different problem from POTS and matters for treatment. The piece on labile blood pressure covers this and other blood pressure patterns in more detail.

Symptoms without the numbers

You can feel dreadful during the test while your numbers stay under these thresholds. That does not mean nothing is wrong. Orthostatic intolerance can show up as symptoms, skin color change, brain fog or a smaller heart rate rise, and some people only meet the criteria on some days. Write the symptoms down just as carefully as the numbers.

What a home test can and cannot tell you

It can show a pattern worth investigating. A clear, repeatable rise in heart rate on standing is useful evidence to bring to an appointment.

It can track change. Repeating the test under the same conditions, for example every few weeks or after a treatment change, shows whether your response is moving.

It cannot rule anything in or out on its own. A single result is affected by the time of day, heat, hydration, salt, sleep, your cycle, recent illness and your medications. A normal result on one day does not rule out POTS, and an abnormal one does not confirm it. Only a clinician, usually with a formal stand or tilt test, can make the diagnosis.

When to involve a clinician

Bring your log to your doctor if the test shows a sustained heart rate rise near the thresholds above, a meaningful blood pressure drop, or symptoms that stop you finishing. Ask whether a formal active stand test or tilt table test makes sense for you.

Seek urgent care if you faint and injure yourself, or if you have chest pain, a very fast or irregular heartbeat at rest, severe shortness of breath, or new weakness, numbness or difficulty speaking.

The bottom line

The NASA lean test is ten minutes against a wall, a helper, a cuff and a careful log. Done safely and repeated under consistent conditions, it is one of the most useful pieces of evidence you can gather at home about how your body handles being upright. Treat it as a screen that starts a conversation with your clinician, not as an answer in itself.

Frequently asked questions

Can I do the NASA lean test by myself? It is not safe to do it alone. You need someone to take blood pressure readings and to help you if you become faint.

What heart rate increase suggests POTS? Clinicians look for a sustained rise of 30 beats per minute or more within 10 minutes of being upright, or 40 or more for ages 12 to 19, without a significant blood pressure drop. A home result needs confirming by a clinician.

Do I need a blood pressure cuff, or is heart rate enough? You need the cuff. Without blood pressure, you cannot tell POTS apart from orthostatic hypotension, and the difference matters for treatment.

Should I stop my medications before the test? Not for a home test. Clinic protocols sometimes pause certain medications, but only under medical supervision. Take your usual medications and note them in your log.

How often should I repeat it? Often enough to see a trend, not so often that it wears you out. Every few weeks, at the same time of day and under similar conditions, is a reasonable rhythm for most people.