Getting a POTS (postural orthostatic tachycardia syndrome) diagnosis requires meeting a specific heart rate threshold on a standing or tilt table test: your heart rate must increase by at least 30 beats per minute within 10 minutes of standing up from a lying position. For adolescents, the threshold is 40 beats per minute. But reaching that test often means navigating a path through multiple doctors and ruling out other conditions first.
What Doctors Look For
The core diagnostic criterion is straightforward. When you move from lying flat to standing, your heart rate must spike by at least 30 bpm (40 bpm for teens) within the first 10 minutes, and that spike must happen without a significant drop in blood pressure. If your blood pressure drops substantially when you stand, that points toward a different condition called orthostatic hypotension rather than POTS.
Before confirming POTS, your doctor also needs to rule out simpler explanations for a fast heart rate. Dehydration, anemia, thyroid disorders, and certain medications can all cause your heart to race when you stand. A condition called inappropriate sinus tachycardia, where the heart rate stays elevated regardless of position, also looks similar but has a different pattern. Expect blood work and possibly other tests to cross these off the list.
The Tilt Table Test
The gold standard diagnostic tool is the tilt table test. You lie flat on a motorized table for about five minutes while sensors track your heart rate, blood pressure, and oxygen levels. Sticky electrode patches go on your chest, and a blood pressure cuff wraps around your arm or wrist. Then the table tilts upward to simulate standing.
You stay in this upright position for anywhere from 5 to 45 minutes while the monitoring continues. If your heart rate climbs to meet the diagnostic threshold without your blood pressure crashing, that’s a positive result. If nothing happens after 45 minutes, you may receive a medication through an IV that provokes the nervous system response, followed by another 15 to 20 minutes of monitoring. The whole process is uncomfortable but not painful, and you’re strapped to the table so there’s no risk of falling.
Not every doctor has a tilt table. Some use a simpler “active stand test” in the office, where you lie down for several minutes, then stand up while they monitor your heart rate manually or with a portable device. This is less controlled but can still provide enough data for a diagnosis.
Which Doctor to See
POTS sits at the intersection of several specialties, and no single type of doctor “owns” it. Cardiologists are often the first stop because the main symptom involves heart rate. Neurologists get involved because the underlying problem frequently relates to nerve function. Some patients end up diagnosed through physical medicine and rehabilitation specialists or gastroenterologists, depending on which symptoms showed up first.
The challenge is that many primary care doctors are still unfamiliar with POTS and may attribute symptoms to anxiety or deconditioning. If your initial doctor isn’t taking your symptoms seriously, asking specifically for a tilt table test or a referral to a cardiologist or neurologist who treats dysautonomia (disorders of the autonomic nervous system) can move things forward. Academic medical centers and large hospital systems are more likely to have dedicated POTS programs.
Why POTS Develops
POTS rarely appears out of nowhere. In a survey of nearly 1,000 patients, about a third traced the onset to an infection. COVID was the single most common trigger, responsible for roughly 14% of cases. Mononucleosis and influenza were the next most frequent infectious triggers. Another third of patients couldn’t identify a clear trigger at all.
Physical trauma accounted for about 13% of cases, including surgery, concussions, and car accidents. Hormonal shifts like puberty and pregnancy triggered roughly 9% of cases. These numbers help explain why POTS disproportionately affects women, who are roughly 85 to 90% of patients, and why onset commonly occurs during adolescence or early adulthood when hormonal changes and viral exposures are both common.
Notably, patients whose POTS was triggered by physical trauma tend to report more severe symptoms than those whose condition started after an infection, so the trigger may influence the course of the illness.
The Three Main Types
Not all POTS works the same way in the body, and understanding your subtype can shape how it’s managed.
- Neuropathic POTS is the most common form. Small nerve fibers lining the blood vessels become damaged and can no longer tighten those vessels properly when you stand. Blood pools in your legs, and your heart races to compensate.
- Hyperadrenergic POTS involves an overactive fight-or-flight system flooding your bloodstream with stress hormones. This type often comes with anxiety-like symptoms, tremors, and blood pressure that actually rises when you stand, rather than staying stable.
- Hypovolemic POTS stems from abnormally low blood volume. Your body simply doesn’t have enough fluid circulating, often following an illness or injury that caused significant fluid loss. The heart speeds up because there’s less blood to push around.
Many patients have features of more than one subtype. Your doctor may not formally classify your type, but the distinction matters because treatments that help one form (like increasing salt and fluid intake for hypovolemic POTS) may be less effective for another.
Conditions That Often Travel With POTS
POTS frequently overlaps with other conditions, and recognizing these connections can speed up your diagnostic process. Joint hypermobility, where your joints bend further than normal, shows up in a significant portion of POTS patients. A Houston Methodist study of young women with severe gastrointestinal symptoms found that 73% had POTS and 27% had joint hypermobility syndrome. Mast cell activation syndrome, which causes episodes of flushing, hives, and GI distress, also appears alongside POTS in some patients.
If you’re experiencing digestive problems, joint pain, or allergic-type reactions in addition to the classic POTS symptoms of dizziness, racing heart, and fatigue upon standing, mentioning all of them to your doctor paints a more complete picture. These overlapping conditions sometimes share a root cause, and treating one can improve the others.
Preparing for Your Appointment
Doctors diagnose faster when you bring data. Before your appointment, try tracking your resting heart rate while lying down and again after standing for 2, 5, and 10 minutes, using a fitness tracker or a simple finger pulse oximeter. Do this on several different days. If you’re consistently seeing a jump of 30 or more bpm, bring that log.
Write down your symptoms and when they started. Note whether anything preceded them: a viral illness, surgery, pregnancy, a concussion. List everything that makes symptoms worse (heat, meals, standing in line, exercise) and anything that helps (lying down, compression garments, extra salt). This kind of structured history helps a doctor recognize the pattern quickly instead of ordering months of exploratory tests.
Stay hydrated and eat normally before the appointment unless told otherwise. If you’re scheduled for a tilt table test specifically, your doctor will give you instructions about medications to pause and how long to fast beforehand. The test itself takes about an hour, and you can typically drive yourself home afterward unless you faint during it.