The rest of this guide walks through the tilt protocol step by step, the simpler stand test that can be done in a clinic room, what can skew a reading, and which bloodwork is worth running alongside it.
You lie flat on a motorised table, you are secured with straps, and the table then tilts you head-up while monitors record heart rate and blood pressure continuously. Nothing is injected for a standard assessment, and you stay awake and talking throughout.
The setup is deliberately plain. A padded table with a footboard takes your weight once it tilts, so you are resting on the footboard rather than holding yourself upright. Straps across the chest and knees keep you in position and stop you from bracing with your leg muscles. ECG electrodes follow the heart rhythm, and blood pressure comes either from an arm cuff that inflates on a schedule or from a finger sensor that reads pressure beat by beat.
The test opens with a period of quiet supine rest, so the baseline reflects a settled body rather than the walk from the waiting room. The table is then tilted head-up, usually to an angle between 60 and 70 degrees, and the first 10 minutes upright are the window that matters for assessing orthostatic tachycardia in adults 1. Longer protocols exist when the clinical question is fainting rather than a rapid heart rate.
Throughout, you are asked what you feel, and that log sits alongside the numbers. Light-headedness, visual greying, palpitations, nausea, shakiness, chest tightness and mental fog are all recorded against the minute they appeared. If you come close to fainting, staff lower the table quickly so your legs sit above heart level within seconds.
The pattern is a sustained heart rate rise of at least 30 beats per minute within 10 minutes of head-up tilt in adults, without a sustained blood pressure fall that meets the definition of orthostatic hypotension, in someone whose orthostatic symptoms have lasted at least 3 months 12.
| What the recording shows | Character of the change | How a clinician may read it |
|---|---|---|
| Heart rate up by at least 30 beats per minute within 10 minutes upright, blood pressure broadly held | Sustained and symptomatic | Pattern consistent with POTS in adults when symptoms have lasted at least 3 months 1 |
| Blood pressure falls by more than 20 mmHg systolic or more than 10 mmHg diastolic within 3 minutes of being upright | Sustained drop | Orthostatic hypotension pattern, which is a different problem from POTS 2 |
| Abrupt fall in blood pressure, often with the heart rate slowing, usually later in the tilt and with fainting | Sudden and self-limited | Reflex (vasovagal) pattern |
| Modest heart rate rise, blood pressure maintained, no symptoms | Within expectation | Ordinary orthostatic response |
The word sustained carries weight. A brief jump as the table swings upright, settling within a minute or two, is not the same as a heart rate that climbs and stays climbed. Heart rate is also read next to symptoms, because a number without matching symptoms means something different from a number recorded while you are greying out.
One tracing never diagnoses anything on its own. A clinician reads the tilt alongside your history, how long the symptoms have run, what else is going on, and the results of basic bloodwork before deciding what the pattern represents.
An active stand test asks you to rest lying down and then stand up by yourself while the same two variables are recorded, which makes it cheaper, faster and available almost anywhere. Research suggests that head-up tilt produces larger heart rate increases than active standing in the same person, so a tilt can cross the 30 beats per minute threshold where a stand test does not 3.
| Feature | Active stand test | Head-up tilt table test |
|---|---|---|
| Setting | Clinic room or bedside | Dedicated lab with continuous monitoring |
| How you get upright | You stand up under your own power | The table tilts you passively, usually to 60 to 70 degrees |
| Leg muscle pump | Active, which helps push blood back toward the heart | Largely switched off, so blood pools in the legs |
| Monitoring | Heart rate and blood pressure at set intervals | Continuous ECG, often beat-to-beat blood pressure |
| Window that matters for tachycardia | First 10 minutes upright | First 10 minutes of tilt |
| Fainting risk | Lower, and you can sit down | Higher, with staff lowering the table |
| Access | Simple and widely available | Usually needs a referral and a waiting list |
Neither test is the gold standard in every situation. Expert consensus describes both the standing test and head-up tilt as acceptable ways to document the orthostatic heart rate response 1. A practical sequence is a stand test first, with tilt reserved for unclear results, for fainting that needs explaining, or when a stand test is physically difficult to perform.
Because orthostatic symptoms are easy to misattribute, and an objective recording changes the conversation from description to data. Studies suggest that people with POTS often spend years and multiple consultations before the pattern is recognised, with substantial effects on work, study and daily function 4.
The recording also sorts between patterns that look alike from the outside. Fainting on standing, a steady heart rate climb without a pressure drop, and a pressure drop with little heart rate change all produce dizziness, yet they are different problems with different care paths 2. Knowing which one is on the trace prevents months of guessing.
There is a second benefit that is easy to miss. A documented pattern gives a baseline. If the same measurement is repeated later, there is something concrete to compare against, instead of a memory of how bad things felt on a given week.
Follow the written instructions the clinic sends, because protocols differ between labs and those instructions override anything general you read online. They usually cover whether to eat beforehand, what to drink, what time to arrive and how long to allow.
A few practical points hold across most labs. Wear loose, comfortable clothing, since electrodes go on the chest and a cuff goes on the arm. Bring a written list of everything you take, including anything bought without a prescription, because some medicines change heart rate and blood pressure; ask your prescriber well before the appointment rather than stopping anything yourself. Arrange transport home if fainting is a realistic possibility for you, and expect the appointment to run considerably longer than the tilt itself once setup, baseline rest and recovery are added.
It also helps to arrive with a short symptom history written down. Which positions provoke symptoms, what time of day is worst, how long symptoms take to settle after sitting, and what was happening in the weeks before they started. That context shapes the interpretation as much as the trace does.
Most people describe it as uncomfortable rather than painful, and some feel very unwell for a few minutes near the end. The sensations are the ones you already know from standing still too long, concentrated into a controlled window.
Common experiences include a pounding or racing heartbeat, warmth or clamminess, nausea, ringing in the ears, tunnelling or greying vision, leg heaviness and difficulty following a conversation. Some people faint outright. That is why the test is done with staff present and a table that drops flat in seconds, and why a faint under monitoring is informative rather than a mishap.
Recovery is usually quick once you are horizontal again, though feeling washed out for the rest of the day is common. The needle of an intravenous line is sometimes placed for longer fainting protocols, so ask the clinic in advance whether yours involves one.
Plenty of ordinary things shift the numbers, which is why one recording is read in context rather than as a verdict. The body's orthostatic response is not a fixed trait; it moves with fluid status, sleep, recent illness, activity level and time of day.
Things worth flagging to the person running the test include recent vomiting or diarrhoea, a gap since you last drank anything, a poor night of sleep, a recent infection, a long spell of bed rest or reduced activity, caffeine earlier that day, and a test slot that falls at a time when you normally feel fine. Some medicines also alter the response; ask your prescriber about anything on your list rather than adjusting it.
The method itself matters too. Because passive tilt removes the leg muscle pump, the heart rate rise it produces runs higher than the rise from standing up normally, which is one reason tilt alone can over-call the pattern if the result is read without the clinical picture 3. A sensible clinician reads the trace, the symptoms logged against it, the history and the bloodwork together.
A normal recording means that on that morning, in that room, the pattern was not captured. It does not mean the symptoms are invented, and it does not close the file.
Orthostatic symptoms fluctuate. They are often worse early in the day, after poor sleep, in heat, after illness or after a long stretch of inactivity, so a test booked at a good hour on a good week can miss what a bad morning would have shown. Options a clinician may consider include repeating the measurement at a different time of day, using a stand test at home-like conditions under supervision, or looking more carefully for other explanations of the same symptoms.
It also helps to keep a two-week log of heart rate, posture and symptoms, written in plain terms. Patterns you cannot describe in a 15-minute consultation often show up clearly on a page. Bring it to the follow-up appointment, along with any wearable data, as a prompt for the conversation rather than as a result in itself.
Basic bloodwork comes first because several common, measurable problems produce the same dizziness, racing heart and fatigue. Clinical guidance for evaluating suspected POTS describes an initial work-up that includes a complete blood count, thyroid function and basic chemistry, with further testing directed by the history 6.
The logic is subtraction. If a routine panel shows a low red cell picture, an overactive thyroid pattern or a disturbed electrolyte picture, that finding is worth pursuing in its own right before anything is attributed to autonomic dysfunction. If the panel is unremarkable, the orthostatic recording carries more weight.
None of these results is self-interpreting. A single value outside the standard range is an observation, not a diagnosis, and what it may reflect depends on the rest of the panel, your symptoms and your history. Take the full report to a clinician rather than acting on one line of it.
Hemoglobin is the oxygen-carrying protein inside red blood cells, and a low value can produce light-headedness on standing, palpitations and fatigue that overlap closely with orthostatic symptoms. It is measured from a standard venous draw as part of a complete blood count. Typical lab reference ranges run roughly 13 to 17.5 g/dL in men and 11.5 to 16 g/dL in women, and ranges vary by lab, age and sex. FitScript's optimal range is 14 to 16 g/dL in men and 12 to 15 g/dL in women, and optimal ranges are FitScript's optimization targets rather than diagnostic cut-offs. A result outside the standard range is worth discussing with a clinician promptly rather than interpreted alone.
The useful companions are the ones that explain fatigue, breathlessness and a fast heart rate through a route other than the autonomic nervous system. A clinician decides which apply to you, and the list below is educational rather than a shopping order.
FitScript's membership covers 150+ biomarkers tested per year, with results interpreted by Atlas, FitScript's AI health advisor, and reviewed by a licensed provider. That kind of panel does not test for POTS, which is a clinical pattern rather than a blood result, but it narrows the field of things a blood test can explain.
A fast heart rate on standing is a response, not a disease, and several ordinary states produce it. Low circulating volume after a stomach bug or a hot day, blood loss, fever, recent prolonged bed rest, deconditioning after illness, an overactive thyroid picture, anxiety or panic, and some medicines (ask your prescriber) all raise the upright heart rate.
Two cardiac look-alikes matter in particular. Inappropriate sinus tachycardia involves a high resting heart rate that is not driven by posture, and arrhythmias can produce palpitations that happen to coincide with standing. The two are separated from the orthostatic pattern by the ECG and by the relationship between posture and the heart rate, which is exactly what the tilt or stand recording captures 2.
Deconditioning deserves a plain word, because it overlaps with the picture rather than competing with it. Reduced upright activity lowers blood volume and reduces the heart's filling, and these changes can amplify an orthostatic heart rate response 5. That makes the sequence difficult to untangle in someone who has been unwell and inactive for months, which is a reason to involve a clinician rather than self-label.
They are descriptions of the dominant mechanism in a given person, not separate diseases, and most people show features of more than one. Reviews describe a neuropathic picture with impaired constriction of blood vessels in the lower body, a hyperadrenergic picture with high standing adrenaline-type activity, a low blood volume picture, and a contribution from reduced physical conditioning, with immune and post-infectious factors also described 57.
Onset frequently follows a trigger. The pattern is associated with a preceding infection, surgery or other physiological stressor in a substantial proportion of cases, and orthostatic intolerance resembling POTS has been described after COVID-19 8. It also tends to appear alongside other conditions; POTS is associated with features such as joint hypermobility, migraine, gastrointestinal symptoms and chronic fatigue 7.
For a reader waiting on a tilt result, the practical value of the subtype language is modest. It explains why two people with identical tilt numbers can describe different illnesses, and why care is individualised rather than standard.
The clinician combines the trace with your history, your examination and your bloodwork, then decides whether the pattern fits, whether something else explains the symptoms, or whether more testing is needed. The report alone is not the end point.
Care, where it is offered, is built around the individual picture rather than a single template, and treatment decisions belong to a licensed provider who has reviewed you. Non-drug measures form a large part of the published approach, and research suggests that structured, progressive exercise training may help reduce symptom burden in people with POTS, introduced gradually and under clinical supervision 5. Expert consensus has also flagged better access to coordinated care as a priority, because fragmented follow-up is a common part of the problem 4.
Keep measuring. A simple home log of morning heart rate lying and standing, plus symptoms and activity, gives the follow-up appointment something concrete to work with and shows whether anything is shifting over months rather than days.
Book an appointment whenever orthostatic symptoms are limiting what you can do, and seek care promptly for fainting that causes injury, fainting during exertion, chest pain, new breathlessness, palpitations that do not settle when you lie down, or marked fatigue alongside signs of blood loss such as very heavy periods or dark stools.
Also go back if you have already had a test and nothing has improved. A normal recording with persistent symptoms deserves a second look, not a shrug, and an abnormal recording deserves a plan rather than a label. Never ignore an out-of-range lab result, and never stop or change a prescribed medicine on your own; ask your prescriber.
This page is educational and is not medical advice. Discuss your symptoms, your test results and any treatment with a clinician or licensed provider who can see your full history.
For more on the symptom picture behind this testing, read the guide to pots symptoms, and for the broader list of reasons people feel dizzy when standing up, start there before assuming a single cause.
The tilt itself is short, but the appointment is longer because of setup, a period of quiet rest lying down and a recovery period afterwards. Protocols also differ between labs, and a test looking at fainting usually runs longer than one assessing heart rate alone. Ask the clinic how much time to allow when you book.
It is not painful, though it can feel unpleasant for a few minutes. People often describe a pounding heartbeat, warmth, nausea, greying vision or leg heaviness while upright, and some faint. Staff monitor you the whole time and lower the table quickly if you are close to passing out.
Yes, in many cases. A supervised stand test records the same two measurements, heart rate and blood pressure, while you stand up under your own power, and it is far easier to arrange. A clinician decides whether a stand test is enough or whether a tilt table adds something, particularly when fainting is part of the picture.
Bring a written list of everything you take, including items bought without a prescription, and mention recent illness, vomiting, diarrhoea, poor sleep or a long spell of inactivity. Ask your prescriber before changing anything on your list rather than stopping it yourself. Also tell staff if you have fainted before and what usually brings it on.
Yes. Orthostatic symptoms fluctuate with time of day, sleep, heat and recent illness, so a test booked on a good morning can miss the pattern. A normal result does not mean the symptoms are imagined. Go back to the clinician with a symptom log so the next step can be planned.
Usually yes, because several measurable problems produce the same dizziness, fast heart rate and fatigue. A basic panel typically covers the red cell picture, thyroid function and chemistry. The clinician decides which tests apply to you and reads them alongside the recording rather than separately.
A clinician does. They read the trace next to your history, your examination, the symptoms logged during the test and your bloodwork. A heart rate number on its own is an observation, not a diagnosis, and any decision about care belongs to a licensed provider.
No, but it is useful background. Wearables can show a pattern worth investigating, though they are not validated for formal orthostatic assessment and can misread during movement. Bring the data to your appointment as a prompt for a supervised stand test or tilt rather than as a result in itself.