Enter your supine systolic and diastolic pressure and the readings taken within three minutes of standing. The page returns each change and reports whether the published criterion is met for systolic and for diastolic separately. If a pressure rose instead, the rise is shown as a rise.
The criteria come from the AAS/AAN consensus of 1996: within three minutes of standing, a systolic fall of 20 mmHg or more, or a diastolic fall of 10 mmHg or more. The same thresholds apply on head-up tilt testing at 60 degrees or steeper. About 95% of typical orthostatic hypotension is reported to be identified by the systolic criterion alone. The reproducibility of the thresholds and the time taken to reach the fall are both under discussion for revision (as of October 2026).
A systolic rise of 20 mmHg or more on standing is orthostatic hypertension as defined by a 2022 consensus, a separate concept that should not be confused with orthostatic hypotension. Not meeting the criteria does not mean you do not have orthostatic hypotension either: readings shift with timing, posture and hydration. This page produces no risk score, only the change and the comparison. It is not a diagnosis, and dizziness or fainting on standing should be assessed by a clinician.
Frequently asked questions
Measure once while lying down, then again within three minutes of standing up, and enter all four numbers. Timing matters because the consensus criteria specify the three-minute window.
No. This result cannot rule orthostatic hypotension out, because readings vary with timing and posture. If symptoms persist or get worse, get assessed.
A systolic rise of 20 mmHg or more on standing matches the 2022 consensus definition of orthostatic hypertension. It is a separate concept, so the page reports it on its own line.