What to Expect During POTS Testing in Phoenix

If you have been dealing with dizziness, rapid heartbeat, fainting, palpitations, fatigue, brain fog, or exercise intolerance, your doctor may recommend testing for Postural Orthostatic Tachycardia Syndrome, also known as POTS. For many patients, the hardest part is not just the symptoms. It is the uncertainty.

You may feel fine while sitting or lying down, but then feel lightheaded, weak, shaky, foggy, or short of breath when you stand. You may notice your heart racing after a shower, while waiting in line, during a warm day in Phoenix, or after light activity. You may have had normal blood work, a normal EKG, or a normal exam, yet still feel like something is wrong.

At Center for Neurology and Spine in Phoenix, Arizona, we now offer POTS testing and autonomic evaluation for patients who need answers. Our Mayo-trained neurologists, Dr. Leslie Zuniga and Dr. Rebecca Jones, evaluate patients with symptoms of orthostatic intolerance, dizziness, tachycardia, syncope, brain fog, fatigue, and suspected dysautonomia.

This guide explains what POTS testing is, how to prepare, what happens during the appointment, what the results may show, and how CNS helps patients create a treatment plan after diagnosis.

Why POTS Testing Matters

POTS is a disorder of the autonomic nervous system. The autonomic nervous system controls functions your body manages automatically, including heart rate, blood pressure, sweating, digestion, temperature regulation, and blood vessel tone.

When a person without POTS stands up, the body quickly adjusts circulation so blood continues flowing to the brain. In POTS, that adjustment does not work normally. The heart rate rises too much, and symptoms can develop because the body is struggling to maintain stable circulation while upright.

POTS testing matters because symptoms alone are not enough. Many conditions can cause dizziness, fainting, palpitations, and fatigue. Testing helps identify whether symptoms are related to abnormal heart rate and blood pressure changes during posture change.

This distinction is important because POTS treatment is different from treatment for anxiety, dehydration, inner ear problems, cardiac arrhythmias, thyroid disease, anemia, or medication side effects.

Common Reasons Patients Seek POTS Testing

Patients often come to CNS after months or years of unexplained symptoms. Some have already seen multiple specialists. Others are just beginning the process.

Common reasons to schedule POTS testing include:

Dizziness when standing
Rapid heartbeat with position changes
Palpitations that worsen upright
Near fainting or fainting
Brain fog that improves when lying down
Severe fatigue after standing or activity
Exercise intolerance
Weakness or shakiness
Symptoms that worsen in heat
Symptoms after viral illness
Unexplained nausea with upright posture
Feeling worse after showers or large meals

Patients may also seek testing after being told they have anxiety, dehydration, chronic fatigue, long COVID, or unexplained tachycardia. While those conditions can overlap, POTS testing can help clarify whether autonomic dysfunction is part of the picture.

What Makes POTS Different From Other Causes of Dizziness

Dizziness is common, but POTS has a specific pattern. Symptoms are usually worse when upright and better when lying down. The heart rate rises excessively after standing, often without a major drop in blood pressure.

This posture-related pattern is one of the biggest clues.

For example, a patient with POTS may say:

I feel okay when I wake up, but I feel terrible after standing in the bathroom.

My heart races when I stand, but my EKG was normal.

I can sit and work, but standing in line makes me feel faint.

I feel worse after hot showers.

My symptoms are much worse during the Phoenix summer.

These details help guide the evaluation.

Before Your POTS Testing Appointment

Preparation can make your visit more useful. Before your appointment at CNS, gather as much information as possible about your symptoms and prior testing.

Helpful items to bring include:

A list of symptoms
A list of medications and supplements
Prior EKG or heart monitor results
Recent blood work
Emergency room records
Cardiology notes if available
Prior tilt table results if already done
A symptom diary
Home heart rate or blood pressure readings if available

What to track before the visit

If possible, track:

Heart rate while lying down
Heart rate after standing
Blood pressure while lying and standing
Time of day symptoms occur
Fluid intake
Salt intake if already advised by a clinician
Heat exposure
Exercise tolerance
Fainting or near fainting episodes
Sleep quality
Migraine or headache patterns
Menstrual cycle timing if relevant

This information helps your neurologist understand your day-to-day pattern, not just what happens during one office visit.

What Happens During a POTS Evaluation at CNS

A POTS evaluation usually begins with a detailed history. The neurologist will ask about your symptoms, triggers, duration, medical history, medications, and prior evaluations.

Important questions may include:

When did symptoms begin
Did symptoms start after illness, surgery, pregnancy, concussion, or COVID
Do symptoms worsen with standing
Do symptoms improve when lying down
Have you fainted
Do you have migraines
Do you have neuropathy symptoms
Do you have joint hypermobility
Do you have digestive symptoms
Do you have sleep problems
Do you have abnormal sweating or temperature intolerance

The neurologic exam may assess:

Reflexes
Strength
Sensation
Balance
Gait
Coordination
Eye movements
Signs of neuropathy
Signs of other neurologic conditions

This matters because POTS can overlap with migraine, small fiber neuropathy, Ehlers-Danlos syndrome, long COVID, chronic fatigue syndrome, and other neurologic or systemic conditions.

Orthostatic Vital Signs

Orthostatic vitals measure how heart rate and blood pressure change when moving from lying down to standing.

A typical assessment may include:

Measurements while lying down
Measurements shortly after standing
Repeated measurements over several minutes
Symptom tracking during the position change

The goal is to see whether the heart rate rises abnormally and whether blood pressure remains stable or drops.

Tilt Table Testing

Tilt table testing is one of the most useful tests for patients with suspected POTS, syncope, or orthostatic intolerance.

During a tilt table test:

You lie on a special table
Your heart rate and blood pressure are monitored
You are secured safely on the table
The table moves from lying to upright positioning
Your symptoms are recorded during the test
The clinician watches for heart rate and blood pressure patterns

The purpose is to simulate standing while carefully monitoring your body’s response.

Tilt table testing can help identify:

POTS
Vasovagal syncope
Orthostatic hypotension
Delayed orthostatic intolerance
Abnormal autonomic responses

It can also help determine whether your symptoms match measurable physiologic changes.

Additional Autonomic Testing

Depending on your symptoms, additional testing may be recommended.

This may include:

Heart rate variability testing
Valsalva testing
Sweat function testing
Blood pressure response testing
Review of autonomic reflexes

These tests help evaluate how the autonomic nervous system responds to stress, breathing, position change, and circulation demands.

What POTS Testing Results Can Show

POTS testing may show several different patterns.

Pattern one
Heart rate increases significantly with standing or tilt, without a major blood pressure drop. This pattern may support POTS if symptoms fit.

Pattern two
Blood pressure drops when standing. This may suggest orthostatic hypotension rather than POTS.

Pattern three
Heart rate and blood pressure change before fainting. This may suggest vasovagal syncope.

Pattern four
Testing is normal, but symptoms persist. This does not mean symptoms are not real. It may mean another condition is causing symptoms, or that symptoms were not triggered during testing.

Pattern five
Findings suggest overlapping conditions, such as POTS with migraine, neuropathy, or medication effects.

This is why interpretation by a neurologist is important. Results must be matched to the full clinical picture.

What Happens After POTS Testing

After testing, your neurologist will review the results with you and explain what they mean.

The discussion may include:

Whether you meet criteria for POTS
Whether another diagnosis is more likely
What triggers may be contributing
Whether medication changes are needed
Whether further testing is recommended
How to begin treatment safely
How to manage symptoms in Arizona heat
How follow-up will be handled

The goal is to leave with a plan, not just a test result.

Treatment Planning After Diagnosis

POTS treatment is individualized. There is no single plan that works for every patient. Treatment usually begins with education and lifestyle strategies, then adds medications when appropriate.

Common treatment strategies may include:

Increasing fluids when medically appropriate
Increasing salt intake when medically appropriate
Compression garments
Avoiding prolonged standing
Heat avoidance
Gradual exercise conditioning
Smaller meals
Sleep optimization
Trigger tracking
Medication review
Heart rate control medication in selected patients
Blood volume support in selected patients

Your plan depends on your blood pressure, heart rate, symptoms, lifestyle, other diagnoses, and medical history.

Why Arizona Patients Need a Local POTS Plan

Arizona heat can make POTS symptoms worse. Phoenix summers increase sweating and fluid loss. Heat causes blood vessels to widen, which can worsen blood pooling and dizziness.

A POTS treatment plan in Arizona should include:

Heat avoidance strategies
Hydration planning
Cooling tools
Activity timing
Safe exercise options
Travel and work planning
School or workplace accommodations when needed

For many patients, symptom control improves when the plan matches real life in the desert climate.

POTS and School or Work

POTS can interfere with school, work, and daily responsibilities. Patients may struggle with standing, walking across campus, sitting upright for long periods, concentrating, or recovering after activity.

Common challenges include:

Brain fog during long workdays
Difficulty standing during presentations
Fatigue after commuting
Symptoms during hot parking lot walks
Faintness in long lines
Trouble exercising
Need for frequent breaks

A diagnosis can help patients explain symptoms and request reasonable accommodations when appropriate.

Possible accommodations may include:

Access to water
Ability to sit when needed
Temperature control
Flexible scheduling
Rest breaks
Modified physical activity
Remote work or school options when appropriate

POTS and Long COVID

Many patients developed POTS-like symptoms after COVID or another viral illness. These patients often describe a sudden change from normal function to persistent tachycardia, fatigue, dizziness, brain fog, and exercise intolerance.

Testing can help identify whether post-viral dysautonomia is present. It can also help guide pacing, conditioning, hydration, and symptom management.

POTS and Migraine

POTS and migraine commonly overlap. A patient with both may experience dizziness, light sensitivity, nausea, head pressure, fatigue, and brain fog.

At CNS, patients can be evaluated for both autonomic dysfunction and headache disorders. This is important because treating migraine may improve overall function, but migraine therapy alone may not fully address orthostatic symptoms.

POTS and Neuropathy

Some patients with POTS also have symptoms of nerve dysfunction, including burning, tingling, numbness, abnormal sweating, or color changes in the hands and feet.

When neuropathy symptoms are present, EMG testing or other nerve-related evaluations may be considered depending on the clinical picture. CNS provides neurologic evaluation for neuropathy and autonomic symptoms, helping patients understand whether multiple systems are involved.

When POTS Testing Is Especially Important

POTS testing may be especially helpful if:

Symptoms are interfering with work or school
You have fainted more than once
You feel dismissed or misdiagnosed
Symptoms are worse when upright
Cardiology testing has not explained symptoms
You developed symptoms after a virus
You have brain fog with tachycardia
Symptoms worsen in heat
You want objective documentation of autonomic dysfunction

Testing can provide clarity and help guide treatment.

Frequently Asked Questions

How long does POTS testing take?

The length of testing depends on the protocol used. Tilt table testing and autonomic evaluation may take longer than a routine office visit because heart rate and blood pressure must be monitored over time.

Is tilt table testing painful?

Tilt table testing is not usually painful. Some patients feel dizzy, nauseated, weak, or faint because the test is designed to reproduce symptoms in a monitored setting.

Can I drive after POTS testing?

Ask your care team before the test. If you tend to faint or feel unwell after testing, it may be safer to have someone drive you.

Should I stop medications before testing?

Do not stop medications unless instructed by your clinician. Some medications affect heart rate and blood pressure, so your care team will provide guidance.

Can POTS be diagnosed without a tilt table test?

Sometimes standing tests and clinical history are enough, but tilt table testing can provide more detailed information and help distinguish POTS from other conditions.

What if my test is normal?

A normal test does not mean your symptoms are fake. It may mean symptoms were not triggered during testing, or another condition may be causing them.

Does POTS go away?

Some patients improve significantly, especially with treatment and conditioning. Others have chronic symptoms that require ongoing management.

Can POTS be treated?

Yes. While there is no single cure, many patients improve with individualized lifestyle changes, conditioning, trigger management, and medication when appropriate.

Why Choose CNS for POTS Testing in Phoenix

Center for Neurology and Spine offers POTS testing and autonomic evaluation in Phoenix for patients with dizziness, rapid heartbeat, fainting, fatigue, brain fog, palpitations, and exercise intolerance.

Patients choose CNS for:

Mayo-trained neurologists
Neurologist-led autonomic evaluation
POTS testing in Phoenix
Tilt table testing
Autonomic testing Arizona
Care for overlapping migraine and neuropathy
Clear explanation of results
Personalized treatment planning

Dr. Leslie Zuniga and Dr. Rebecca Jones provide specialized neurologic care for patients across Phoenix, Scottsdale, Tempe, Mesa, Chandler, Gilbert, Glendale, Peoria, Paradise Valley, Ahwatukee, and surrounding communities.

Schedule POTS Testing in Phoenix

If you are tired of living with unexplained dizziness, rapid heartbeat, fainting, fatigue, or brain fog, Center for Neurology and Spine can help.

Our Phoenix POTS testing program is designed to provide objective answers and a clear path forward.

Visit cnsofaz.com to request an appointment and learn more about autonomic testing in Arizona.

 

What to Expect During POTS Testing in Phoenix AZ

Learn what happens during POTS testing, tilt table testing, and autonomic evaluation at CNS in Phoenix. Get answers for dizziness, rapid heartbeat, fainting, fatigue, and brain fog.

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