I'm not too keen on the tilt-table testing myself. I may be wrong about this, but it seems to essentially let a person know if they have some kind of OI, or POTS, or some kind of syncope. I always assumed a person can figure this out on their own by standing up from a sitting position, and see if you get the sensation of vertigo, or lightheadedness, or a feeling of blood draining out of the brain.
As someone who has a diagnosis of Orthostatic Intolerance (Neurally Mediated Hypotension, aka, Neurocardiogenic Syncope and other names) I can tell you that there is a big difference between simple Orthostatic Hypotension (e.g., standing up quickly and getting lightheaded, seeing "stars") and the symptoms that I have. It's not something that's so obvious.
For example, you said that most patients could figure out that they have OI without any testing. I went for five years without having any idea that I had OI. This was many years ago (1990-1995) so I hope that doctors know more about the tie between ME/CFS and OI by now. The way I found out about it was from the Johns Hopkins research done by doctors Rowe, Calkins and Bou-Holaigah (a friend was in their initial study in 1995). But one patient on this forum posted recently that she had no idea about OI even though she's been having these symptoms for years. So there are still people out there who don't know about OI. Heck, there are still doctors who ask me "What's that?" when I mention either OI or NMH.
As another example, I have never fainted except during the tilt table test. Doctors never even considered OI as a possibility. They thought (at least my own doctors, maybe not all doctors) that all patients with some type of OI would faint. But that's not true. Many ME/CFS patients who also have some form of OI may get pre-syncope symptoms but they
never faint.
Here's
one site that mentions that most patients with OI (they use the term Chronic Orthostatic Intolerance) do not faint except during testing:
Chronic Orthostatic Intolerance
In chronic orthostatic intolerance, patients are ill on a day-to-day basis. Chronic orthostatic intolerance may be confused with syncope because chronic illness is sometimes punctuated by acute syncopal episodes. However, this is unusual during real life (albeit common during artificial testing environments), and the author's work suggests no increase in the incidence of syncope above that in the general population. The physician should rely on the patient's history to determine whether chronic illness is present. Thus, chronic orthostatic intolerance is defined by a history of symptoms of orthostatic intolerance present on a day-to-day basis
And here's their list of symptoms:
Defining symptoms of chronic orthostatic intolerance include dizziness in all patients, with high incidence of the following conditions:
- Altered vision (blurred, "white outs", "black outs")
- Fatigue
- Exercise intolerance (frequently post-exercise malaise)
- Nausea
- Neurocognitive deficits
- Sleep problems
- Heat
- Palpitations
A large proportion of patients also experience the following symptoms:
- Headache
- Tremulousness
- Difficulty breathing or swallowing
- Sweating
- Pallor
- Other vasomotor symptoms
These symptoms are divisible into symptoms of sympathetic activation and symptoms of reduced cerebral blood flow.
A tilt table test costs about a $1,000 or so. Like I say, I may be wrong on my take of this, but I really have my doubts about the value of this test.
I agree that there is a cost/benefit analysis to be done. I would not recommend that every patient take a tilt table test! It depends on the patient. But there is at least one situation where it is important -- getting evidence for a disability insurance claim.
Also, if a patient does decide to get a tilt table test then it's important to do the right protocol and get a doctor who knows how to interpret the results. If you have a form of OI like NMH, where the abnormal response does not happen immediately but is a delayed reaction, and they only test you for 10 or 15 minutes, you may not get any useful results.
The recommendation is for the first phase of testing to last 40 or 45 minutes long. It took 20 minutes on my first tilt table test, and 30 minutes on my second one, before the severe plummet in blood pressure happened.
Note: I really did not want to take a second test at all, especially since I knew how bad I would feel after the test! But it was required for my ERISA disability claim.
I hope this helps! It's quite a complicated situation.