I'm having a tilt table test to figure out if I have POTS soon. My period is super irregular so I don't have them every month, but I'm noticing signs that I might be in the pre-menstrual / luteal phase and that a period is impending. I'm concerned that the hormonal changes (whether I'm in the pre-menstrual phase or menses phase) will affect my results. Does anyone know if that can happen? With my orthostatic blood pressure and heart rate readings at home, I've been told that there is no doubt that I have POTS. I suppose my concern is that if I do have POTS, and the tilt table test results are falsely negative, that I won't get the chance for treatment that I need. My symptoms haven't been taken seriously in the past and it would really be detrimental to get a false negative. Also, I occasionally have "white coat syndrome" where my blood pressure goes up when I'm really anxious/feeling threatened. So I'm a little worried that will happen during my test. Does anyone know if the staff account for that, or how that can be prevented?