What an active stand can answer
The highest pulse or lowest pressure is only one part of the result. Record what changed, when it changed, when symptoms started, and whether standing stayed safe. Fogginess, dim vision, weakness, nausea, palpitations, or near-fainting can happen without reaching a standard cutoff. A high heart rate can also come from dehydration, anemia, fever, pain, medicine, blood loss, thyroid disease, or long bed rest instead of POTS.
Pressure
Did pressure fall, stay close, or rise?
The first 3 minutes carry the classic orthostatic-hypotension question, while later readings can show a delayed or mixed response.
Heart rate
Was the pulse rise sustained?
Repeated readings separate a brief transition spike from a rise that remains present across the 10-minute window.
Symptoms
Did standing reproduce the symptoms?
Fogginess, dim vision, weakness, nausea, palpitations, color change, and recovery after lying down can matter even without a standard threshold.
One active stand cannot diagnose POTS, fainting disorders, heart-rhythm or nervous-system problems, low blood volume, anemia, thyroid disease, ME/CFS, or Long COVID. It also cannot find the cause of brain fog. It does not measure brain blood flow, blood volume, or heart rhythm.
Save this test
Save the whole active-stand series to My Fog
Keep pressure, heart rate, symptoms, position, time, safety, and trigger context together so a clinician can see which event actually happened.
My Fog stores the readings and details you enter. A clinician still needs to check the device and heart rhythm, explain the result, choose treatment, and decide whether another stand is safe.
Who needs an age-aware or safer active-stand plan
Age, pregnancy, baseline fitness, illness, medicines, mobility, and fall risk affect both safety and interpretation. The adult heart-rate threshold is not universal, and no heart-rate category measures how much the symptoms disrupt life.
Children and teenagers
Use pediatric supervision, a correctly sized cuff, and the full symptom and function history. Ages 12 through 19 use a sustained rise of at least 40 bpm for the POTS heart-rate criterion, not the adult 30 bpm number. Younger children need specialist age-aware interpretation. A 2026 adolescent study found similar disability whether or not the active-stand heart rate crossed the POTS category.
Adult women and men
POTS is reported more often in women, but the adult heart-rate cutoff is the same for women and men. Record periods or other blood loss, possible pregnancy, illness, body size, fitness, medicines, and when symptoms happen. These details are more useful than using sex as the explanation.
Pregnancy and the months after birth
Ask maternity care whether and how to perform a prolonged standing series, which resting position to use, and how pregnancy physiology changes interpretation. Symptom course can vary during pregnancy and after birth. Fainting, bleeding, severe headache, vision change, chest pain, breathing trouble, upper abdominal pain, marked swelling, or concerning high pressure needs direct maternity or emergency advice.
Older adults and people at higher fall risk
Use a trained helper and do not force 10 minutes. Frailty, neurodegenerative or autonomic disease, diabetes, hypertension, after-meal symptoms, multiple medicines, and high lying pressure can change the response. A shorter safety-limited series and direct fall assessment can be more useful than completing a POTS protocol.
How to record orthostatic vital signs
Ask what question the series needs to answer. Three minutes is used for the classic orthostatic-hypotension window. Ten minutes is used when postural tachycardia or another longer upright response is suspected. Do not mix results from a quick seated screen, 3-minute stand, 10-minute active stand, NASA Lean Test, and tilt table as if they were one method.
Use a clinic or trained helper when fainting, falls, pregnancy symptoms, a serious heart condition, severe weakness, poor balance, or inability to stand safely is present. Keep a bed or stable chair directly behind the person and clear the surrounding floor.
Use a validated upper-arm blood-pressure monitor with the correct cuff size and a reliable heart-rate reading. Put the cuff on bare skin, support the arm near heart level, use the same arm, and keep talking, walking, leg movement, and fidgeting low.
Keep ordinary food, fluid, salt, caffeine, nicotine, medicines, and prescribed compression unchanged unless the clinician or testing service gives a specific plan. Do not fast, dehydrate, overdrink, load salt, remove compression, stop a beta blocker or other prescription, or exercise hard to force a result.
Record the date, start time, room temperature, recent meal and drinks, alcohol, caffeine, nicotine, medicines, doses, compression, sleep, and exercise. Add heat, a shower, fever, pain, vomiting, diarrhea, bleeding, periods, pregnancy, recovery after birth, and recent time in bed. Morning responses can be larger, so keep the time of day with every comparison.
Lie flat for 5 to 10 minutes. Record the final lying blood pressure, heart rate, symptoms, arm, cuff, and device. For a POTS check, use the same planned baseline and standing schedule each time. Do not pick the lowest lying pulse after the test.
Stand in one safe movement and start the timer when fully upright. Record blood pressure, heart rate, and symptoms at 1, 3, 5, 8, and 10 minutes for a longer test. Some clinics record them every minute. Keep the exact stop time if the test ends early.
Stop and sit or lie down for near-fainting, a fall, severe chest pain, marked breathing trouble, new neurological symptoms, severe weakness, or another concerning change. Do not remain upright just to complete a threshold check. An early safety stop is part of the result.
Record which upright symptoms the test checks
Write whether this is a 3-minute pressure check or a 10-minute combined heart-rate, pressure, and symptom series. The result only makes sense with the planned duration.
Build a quiet lying baseline
Lie flat for 5 to 10 minutes. Before standing, record blood pressure, heart rate, symptoms, device, cuff, arm, and room details.
Keep every planned standing time
Record pressure, heart rate, and symptoms at 1 and 3 minutes. Continue to 5, 8, and 10 minutes only when the plan includes the longer stand and standing stays safe.
Calculate changes from the same baseline
Keep each standing heart-rate change and each systolic and diastolic change beside the original values. A single maximum pulse without its pressure, time, and symptoms is not the series.
Read pressure before applying a POTS label
A classic 20/10 pressure fall in the first 3 minutes follows the orthostatic-hypotension path. A sustained age-specific heart-rate rise without that fall is only one part of a POTS assessment.
Preserve symptoms and the stop point
Record when fogginess, dim vision, nausea, weakness, tremor, palpitations, chest discomfort, breathlessness, color change, or near-fainting began and how quickly lying down helped.
How to read an active-stand result
Read the planned duration, pressure, heart rate, symptoms, safety, and cause review together. These four paths keep one number from replacing the full assessment.
The series is incomplete, unsafe, or not comparable
The series is unsafe, incomplete, or not comparable
A key detail is missing, or the person could not stand safely. Check the lying rest, test length, device, cuff, arm, times, blood pressure, heart rate, symptoms, and stop reason. Keep what happened. Repeat only with a safer set plan when the result would change care.
No common pressure or sustained heart-rate threshold was reached
No classic 20/10 pressure fall and no sustained age-specific heart-rate rise
This series did not meet those common cutoffs. An early or late blood-pressure fall, fainting response, heart-rhythm problem, reduced brain blood flow, or symptoms without a fast heart rate may still fit. Symptoms during the test and an early stop still need an explanation.
The pressure fall meets the classic first-3-minute threshold
A sustained fall of at least 20 mmHg systolic or 10 mmHg diastolic within 3 minutes
This follows the classic orthostatic-hypotension path when the lying-to-standing method is valid. Review heart rate, symptoms, high blood pressure while lying down, medicines, meals, dehydration, bleeding, illness, heart disease, diabetes, anemia, hormones, and nervous-system causes.
The heart-rate rise meets the age-specific 10-minute criterion
A sustained rise of at least 30 bpm in adults or 40 bpm at ages 12 through 19 within 10 minutes, without classic orthostatic hypotension
This meets the heart-rate portion of a POTS assessment when the rise appears in at least two readings at least 1 minute apart. POTS still requires frequent upright symptoms that improve lying down for at least 3 months and no better cause. A pressure rise, mixed response, or symptoms outside these thresholds needs its own interpretation.
The heart-rate number does not measure how ill someone is
Symptoms without tachycardia can still disrupt standing, walking, showering, meals, school, work, and concentration. A 2026 adolescent study found similar disability in chronic orthostatic intolerance with and without the POTS heart-rate classification. Keep function and symptom recovery beside the vital signs.
See research details
Each number below stays attached to its method, age, duration, population, and limitation. Do not lower a threshold, diagnose a syndrome, or start treatment from one series.
Decide the question before starting. Do not label a 3-minute pressure screen as a complete 10-minute active stand.
Keep the symptom history, pressure response, repeated readings, duration, and cause review. Do not diagnose from a single maximum pulse or an absolute heart rate of 120 alone.
Keep the exact schedule used. A home pulse screenshot without pressure, symptoms, and position cannot replace this series.
Keep the method name with the result. A negative active stand can lead to repeat or tilt assessment when the history remains strong, but do not lower the threshold yourself.
Use the age-specific threshold for classification, then assess school, walking, showering, meals, concentration, recovery, and safety separately. Missing 40 bpm does not make the symptoms minor.
Ask if testing needs continuous monitoring when symptoms start immediately, recover before 1 minute, or remain unexplained. Do not infer brain oxygenation from an arm cuff.
Compare like with like and record what was different. Review causes before treating the heart-rate change as a syndrome.
What you can do after an active stand
Start by preventing falls and noting how meals, heat, posture, and activity affect the readings. The next action should fit the person's blood pressure, heart, kidneys, pregnancy, medicines, migraine, mobility, and post-exertional response.
Lie down before a faint
If vision dims, hearing fades, legs weaken, or you feel close to fainting, sit or lie down immediately and raise the legs if that is safe. Do not keep standing to complete a time point.
Make a short upright-symptom record
For several ordinary days, note getting out of bed, showers, heat, meals, standing still, bowel symptoms, exercise, illness, bleeding, menstruation, alcohol, poor intake, and medicine timing. Notice when symptoms ease after sitting or lying.
Use slower position changes when they help
Move from lying to sitting, pause, then stand with support nearby. Ask whether physical counter-pressure movements are suitable if presyncope recurs. Stop any movement that causes chest pain, severe breathlessness, new neurological symptoms, or near-fainting.
Keep ordinary food and fluid visible
Check whether symptoms worsen after a large meal, alcohol, heat, vomiting, diarrhea, fever, or poor intake. Keep ordinary meals and fluid steady while testing unless the clinical team gives a different plan. Ask before making a large salt or fluid change.
Review medicines without stopping them
Bring prescriptions, over-the-counter medicines, stimulants, decongestants, inhalers, diuretics, blood-pressure medicines, antidepressants, and supplements with dose times. Ask which could raise pulse, lower pressure, or limit compensation. Do not stop treatment for a cleaner test.
Do not start a fixed salt or fluid amount, buy compression, begin a stimulant, stop medicine, or force an exercise plan. People with high blood pressure, heart or kidney disease, pregnancy, fainting, migraine, or worse symptoms after effort need an individual plan.
What to save from orthostatic vital signs
Keep these together
- Date, time, location, and question being tested
- Planned 3-minute or 10-minute method
- Clinic, home, clinician, helper, and safety setup
- Device, cuff size, arm, support, and heart-rate source
- Supine rest duration and final lying symptoms
- Lying systolic, diastolic, and heart rate
- Standing transition and timer start
- Every collected 1-, 3-, 5-, 8-, and 10-minute set
- Heart-rate and pressure changes from the same baseline
- Exact symptom onset, peak, easing, and recovery
- Stop time, stop reason, near-fainting, fall, or injury
- Meals, fluid, salt, caffeine, nicotine, alcohol, and heat
- Exercise, sleep, illness, fever, vomiting, diarrhea, and bleeding
- Menstruation, pregnancy, postpartum, age, and mobility context
- Medicines, dose timing, supplements, and compression
- ECG or rhythm findings when available
- Clinician interpretation, cause review, action, and repeat reason
Question for the visit
“Does this active stand show a classic pressure fall, sustained age-specific tachycardia, pressure rise, unsafe or mixed response, or symptoms without a standard threshold, and what cause review or next test would change care?”
Sources for Orthostatic Vital Signs and Active Stand Test
Five-minute lying baseline, 1-minute and 3-minute pressure and pulse readings, symptoms, and fall safety.
Orthostatic intolerance symptoms and the role of bedside vital signs, standing, and tilt measurements.
Three-minute active stand for suspected orthostatic hypotension and 10-minute testing for suspected POTS or wider orthostatic intolerance.
Plain-language upright symptoms, basic blood-pressure and heart-rate assessment, triggers, safety, and referral.
Current criteria, 5-to-10-minute baseline, 1-, 3-, 5-, 8-, and 10-minute readings, competing causes, morning variation, and cause review.
US clinician explanation of the 10-minute standing test, age-specific heart-rate criteria, pressure exclusion, symptoms, and diagnostic limits.
Current Australian clinician worksheet, minute-by-minute series, age-specific heart-rate change, pressure check, symptoms, confounders, and negative-test limit.
Pregnancy and postpartum dizziness, fainting, headache, vision, breathing, swelling, and high-pressure safety boundary.
Pressure threshold, hypertension, medicine, trigger, cause, and treatment-safety context.
POTS criteria, timed active-stand method, sustained readings, symptom duration, competing causes, age, sex, and morning variation.
Continuous beat-to-beat active-stand method and the spectrum of early pressure and heart-rate responses.
Immediate, classic, delayed-recovery, and delayed orthostatic-hypotension timing and assessment.
Orthostatic hypotension definition, hypertension interaction, measurement error, triggers, medicines, and causes.
Direct 60-person active-stand versus tilt comparison, threshold capture, hemodynamic differences, and study-proposed 27 bpm limit.
Frailty, blood-pressure drop, heart-rate compensation, delayed recovery, and wide prevalence variation across five studies.
Continuous pressure, heart-rate, and cerebral-oxygenation signals in 2,794 older adults and exploratory prediction limits.
Disability scores in 92 adolescents with chronic orthostatic intolerance, split evenly by POTS classification.
Pregnancy and postpartum symptom variability and the limited evidence base.
See each claim's sources
procedure
A standard 3-minute orthostatic series uses a lying baseline and blood pressure, heart rate, and symptoms at 1 and 3 minutes to assess classic orthostatic hypotension.procedure
A 10-minute active stand extends the combined heart-rate, blood-pressure, and symptom series when POTS or another form of orthostatic intolerance is suspected.procedure
A clinician POTS series can use 5 to 10 minutes supine followed by measurements at 1, 3, 5, 8, and 10 minutes standing.range
The POTS heart-rate criterion is a sustained rise of at least 30 bpm in adults or at least 40 bpm at ages 12 through 19 within 10 minutes, with no substantial orthostatic hypotension, frequent upright symptoms for at least 3 months, and no better cause.interpretation
The qualifying heart-rate rise should appear in at least two standing readings taken at least 1 minute apart rather than in one transient value.range
A sustained fall of at least 20 mmHg systolic or 10 mmHg diastolic within 3 minutes follows the classic orthostatic-hypotension path.limitation
In 60 people with established POTS, 74 percent met the usual heart-rate criterion during active stand and 98 percent during tilt, so the methods should not be treated as interchangeable.limitation
The 27 bpm active-stand threshold explored by Uppal 2025 is a study proposal, not a replacement diagnostic criterion for personal use.context
A 2026 study of 92 adolescents found no meaningful disability-score difference between 46 with POTS and 46 with chronic orthostatic intolerance, so the heart-rate category does not measure functional burden.limitation
Continuous beat-to-beat active-stand research captures early pressure and cerebral-oxygenation signals that an intermittent arm cuff does not measure.interpretation
Dehydration, blood loss, anemia, fever, pain, infection, hyperthyroidism, prolonged bed rest, medicines, and recreational substances can explain standing sinus tachycardia and must be reviewed before POTS is diagnosed.safety
Pregnancy and postpartum symptoms vary and require maternity-aware interpretation and direct assessment of warning symptoms rather than an unsupervised prolonged stand.safety
A standing series should stop when the person becomes unsafe, and an early stop must not be recorded as a negative result.