I am neither a doctor nor a sleep tech, but I definitely have doubts about the accuracy of the take-home test kits. I did one of those at-home tests a few years ago, and was told I exhibited 'no signs' of sleep apnea. Just recently, I went in for a real sleep study, and was diagnosed with severe sleep apnea, with an AHI of 51. There are a lot of things that
could explain the different results, such as:
1. A wire or sensor came loose, producing erroneous data.
2. I didn't have SA back then, but managed to develop it later.
3. The first doctor was pressured by my HMO not to diagnose SA.
4. The second doctor had a financial incentive to diagnose SA.
However, none of those explanations seem very likely to me. I have exhibited signs of SA for at least the past 8 years, and the first (at-home) sleep study came only after my girlfriend at the time observed me stop breathing on more than one occasion, and insisted that I get it checked out. It was also after I nearly got fired for falling asleep at work. So I find it exceedingly unlikely that the first diagnosis (or lack thereof) was correct. As far as wires coming loose or sensors falling off, I was fairly paranoid about that happening and went to great lengths to make sure that didn't happen. When I woke up the next morning, everything was intact. As far as one or both of the doctors lying for financial reasons, well I wouldn't put it past an HMO to suppress a diagnosis in order to save a few bucks (as short-sighted as that is, considering the many nasty effects on your health that can result from untreated SA). However, considering all the symptoms I've had, I really don't think my current doctor is lying. The diagnosis actually fits the facts for a change.
So, in my estimation, either the take-home testers are just a horribly inadequate tool for diagnosing SA, or my HMO just decided to cover it up. I suspect maybe a little bit of both: the HMO wanted me to just go away, so instead of getting me a proper sleep study, they sent me home with a take-home test kit, knowing full well it was much less likely to lead to a diagnosis. I should have pushed at that point, but I was tired of fighting them every step of the way.
Having said all that, I think take-home kits are better than nothing, especially for people who don't have access to a sleep lab. However, at-home testing should NEVER be the last word on the subject. In other words, if the at-home test fails to produce conclusive data, more testing should be done.