How accurate is the Pulse-Ox test?

I recently took the overnight home pulse-oximeter test. I had to re-do the test twice because I cannot sleep with it on. The first night I woke up after three hours. The machine was across the room!!! (I'm a wild sleeper, can never get comfy) So I took the test again and never actually got to sleep, for sure never hit REM. The third time, I tossed and turned most of the night due to the fact that I used an entire roll of tape to secure it to my body. I don't really feel like I could have possibly gotten and accurate reading. This is a pre-test for the sleep study. I'm afraid nothing will show so I won't know if I have apnea. Thanks in advance!

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