POTS Diagnosis: Tests, Criteria, and How to Get Answers

Getting a POTS diagnosis should not be this hard. The diagnostic criteria are straightforward. The tests are well-established. The condition affects an estimated 1-3 million Americans. And yet the path from first symptoms to confirmed diagnosis remains frustratingly long for most patients.

This guide is designed to arm you with the knowledge you need to advocate for yourself: what the diagnostic criteria actually are, which tests to request, what those tests measure, and who to see. If you suspect POTS, you should not have to wait years for answers.

The Formal Diagnostic Criteria

POTS has well-defined diagnostic criteria, established by consensus among dysautonomia experts. To meet the criteria for POTS, all of the following must be present:

1. Heart rate increase of 30 bpm or more (or an absolute heart rate exceeding 120 bpm) within 10 minutes of standing up from a supine (lying down) position. For adolescents aged 12-19, the threshold is 40 bpm.
2. The heart rate increase is sustained, lasting at least 30 seconds, not just a momentary spike.
3. Symptoms of orthostatic intolerance are present during the upright position, lightheadedness, palpitations, brain fog, nausea, visual changes, presyncope, or other characteristic symptoms.
4. Symptoms have been present for at least 3 months, ruling out transient causes like a brief illness or medication side effect.
5. Absence of orthostatic hypotension, blood pressure does not drop by more than 20/10 mmHg. (If it does, the diagnosis may be orthostatic hypotension rather than or in addition to POTS.)
6. No other medical condition that better explains the tachycardia, such as dehydration, anemia, hyperthyroidism, pheochromocytoma, or inappropriate sinus tachycardia.

These criteria are clear, but they require a provider who knows to test for them. Too many patients have their heart rate checked only while sitting, which misses the entire point of a postural condition.

Tests Used to Diagnose POTS

The Active Stand Test (Lean Test), You Can Do This at Home

The active stand test is the simplest and most accessible POTS screening tool. You do not need a specialty lab or a referral. Here is the protocol:

1. Lie down for 5-10 minutes in a quiet environment. Rest comfortably.
2. Record your resting heart rate and blood pressure while still lying down (use a pulse oximeter and home blood pressure cuff).
3. Stand up and remain standing still (do not walk around, standing still provokes more blood pooling).
4. Record heart rate and blood pressure at 1, 3, 5, and 10 minutes of standing.
5. Note any symptoms at each time point, lightheadedness, palpitations, nausea, brain fog, vision changes, leg discoloration.

If your heart rate increases by 30+ bpm or exceeds 120 bpm during standing, and you experience symptoms, that is strong evidence for POTS. Print or screenshot your results and bring them to your appointment.

For best accuracy, perform the test in the morning before caffeine, in a comfortably cool room, and when well-hydrated. Repeat on 2-3 different days to confirm consistency.

The Tilt Table Test, The Gold Standard

The tilt table test is the most controlled and definitive diagnostic tool for POTS. It is performed in a clinical setting, typically in a cardiology or neurology lab.

What happens: You lie flat on a motorized table that is then tilted to a 60-70 degree angle (nearly upright) while your heart rate, blood pressure, and symptoms are continuously monitored for up to 45 minutes. Unlike active standing, the tilt table eliminates the muscle-pump effect (your legs are not actively supporting you), which can actually provoke a more dramatic response.

What it reveals: A positive tilt table test for POTS shows the characteristic 30+ bpm heart rate rise (or absolute rate above 120 bpm) without orthostatic hypotension. It can also distinguish POTS from neurocardiogenic syncope (vasovagal response), pure orthostatic hypotension, and other forms of dysautonomia.

Limitations: Some patients have a negative tilt table test on a “good day”, POTS symptoms fluctuate, and testing conditions (hydration, time of day, temperature) affect results. If your test is negative but your home active stand data consistently shows the pattern, discuss retesting or a longer tilt duration with your provider.

Additional Diagnostic Tests

Beyond confirming the POTS diagnosis itself, additional testing helps identify the underlying subtype and any contributing conditions:

Ruling Out Mimics: The Differential Diagnosis

Before confirming POTS, your provider should rule out conditions that can mimic or contribute to orthostatic tachycardia:

• Dehydration: Often the simplest explanation for orthostatic tachycardia. Ensure you are adequately hydrated before testing.
• Anemia: Low hemoglobin means the heart must work harder to deliver oxygen, causing compensatory tachycardia.
• Hyperthyroidism: An overactive thyroid directly increases heart rate and can mimic POTS.
• Pheochromocytoma/paraganglioma: Rare tumors that secrete catecholamines, causing episodic tachycardia and hypertension.
• Inappropriate sinus tachycardia (IST): Elevated heart rate at rest and with activity, but not specifically postural.
• Medication effects: Stimulants, decongestants, some antidepressants, and other drugs can cause tachycardia.
• Adrenal insufficiency: Can cause orthostatic symptoms; checked via cortisol testing.

A basic workup should include: CBC, TSH, detailed metabolic panel, cortisol, and an ECG. These are inexpensive, widely available, and rule out common mimics quickly.

Who to See: Finding the Right Specialist

This is where many patients get stuck. Not all cardiologists or neurologists are trained in autonomic disorders, and a provider without dysautonomia experience may not recognize POTS even when the data is clear.

The specialists most likely to diagnose and treat POTS effectively:

• Autonomic neurologist: The most specialized option. These neurologists focus specifically on the autonomic nervous system. Major academic centers (Vanderbilt, Cleveland Clinic, Mayo Clinic, NYU, Stanford) have dedicated autonomic labs. Wait times can be long (3-12 months), but the evaluation is thorough.
• Electrophysiologist (EP cardiologist): Cardiologists who specialize in heart rhythm disorders. Many EPs are comfortable diagnosing and managing POTS, especially if they have seen it before.
• Dysautonomia-aware cardiologist: Some general cardiologists have developed expertise in POTS through experience or continuing education. Ask before booking whether the provider has experience with POTS specifically.
• Dysautonomia-aware primary care provider: Increasingly, internists and family medicine doctors with interest in complex conditions are learning to screen for and manage POTS. They may not perform a tilt table test but can order one and initiate treatment.

Resources for finding a specialist:

• Dysautonomia International physician directory (dysautonomiainternational.org)
• Standing Up to POTS physician list (standinguptopots.org)
• POTS patient communities on social media often maintain local provider recommendations

What to Expect During the Diagnostic Process

A realistic timeline for POTS diagnosis, once you find a knowledgeable provider:

1. Initial consultation (Visit 1): Detailed symptom history, medication review, physical exam including orthostatic vitals. Provider may perform an in-office active stand test. Basic blood work ordered (CBC, TSH, metabolic panel, cortisol).
2. Tilt table test (Visit 2, typically 1-4 weeks later): Formal tilt table testing, often combined with autonomic reflex screen. Results usually available same day or within a week.
3. Subtyping and additional testing (Visit 3, if needed): Based on tilt table results, provider may order catecholamine levels, QSART, blood volume testing, or skin biopsy to determine the underlying mechanism.
4. Diagnosis and treatment plan (Visit 3 or 4): Confirmation of POTS diagnosis, subtype identification, and initiation of treatment, typically starting with lifestyle modifications (salt, fluid, compression, reconditioning) and potentially medication.

From first specialist visit to confirmed diagnosis, expect 4-8 weeks if your provider has a clear pathway. The longest delays are in getting the initial specialist appointment, which is why doing the home active stand test and bringing data to your PCP can accelerate referrals.

Frequently Asked Questions

Can my regular doctor diagnose POTS?

Yes, if they are willing to perform orthostatic vitals correctly (lying down for 5+ minutes, then standing measurements at intervals up to 10 minutes) and are familiar with the diagnostic criteria. Many primary care providers can make a clinical diagnosis of POTS based on an active stand test and symptom history, without a formal tilt table test. However, for subtyping and complex management, a specialist referral is usually helpful.

What if my tilt table test is negative?

A single negative tilt table test does not definitively rule out POTS. The test is affected by hydration status, time of day, room temperature, medications, and day-to-day symptom variability. If your home active stand data consistently shows the diagnostic pattern, discuss retesting under different conditions, a longer tilt duration, or provocation testing. Some experts diagnose POTS based on repeated positive active stand tests even without a positive tilt table.

Does POTS show up on a regular ECG or echocardiogram?

No. Standard cardiac tests (ECG, echocardiogram, stress test) are typically normal in POTS patients. These tests are still useful, they rule out structural heart disease and other cardiac conditions. But a normal ECG does not rule out POTS. If your cardiologist says “your heart looks fine” based only on these tests, without performing orthostatic vitals, POTS has not been evaluated.

Should I stop medications before POTS testing?

Discuss this with your ordering provider. Some medications, beta-blockers, calcium channel blockers, midodrine, fludrocortisone, and stimulants, directly affect heart rate and blood pressure and may need to be tapered before testing to avoid masking the POTS response. Your provider will give specific instructions about which medications to hold and for how long. Never stop medications without medical guidance.

Related Reading

This article is part of our thorough guide to POTS and its management. For information on the full range of POTS symptoms, treatment options, and lifestyle strategies, see our complete resource:

POTS Treatment: The Complete Guide →