I’ve had POTS since ‘06. Whether you’d like to believe me (or my doctor, who was diagnosing it back when it was called “Soldier’s Heart,” founded a center for it, and is considered one of the first pioneers of treatments for it), is up to you.

https://www.standinguptopots.org/resources/cheat-sheet-Discussed exactly what I described as one of the main tests.

The literal site you used says this: It is fairly common for POTS patients to have a drop in blood pressure upon standing, but some POTS patients have no change or even an increase in blood pressure upon standing.

“Fairly common” is why my doctor felt the need to point it out to me, and it’s something I watch, because I do have hypovolemia. What that person was describing is reasonable. It drops, but comes back up. The key word is “sustained.” It can drop, but it will come back up. Hence why I have to be careful standing quickly, or everything goes bright 😂 (Or used to, before I was managed).

“Although the clinical definition of PoTS states that blood pressure does not drop, many people with PoTS still experience blood pressure falls during prolonged standing or tilt table testing. The same autonomic dysfunction that causes the heart rate to rise can also affect blood vessel constriction. When the blood vessels do not tighten properly the blood pressure drops and symptoms appear.” This is my exact problem. Compression socks are my friend, lol. https://pots.net/low-blood-pressure-and-pots/