I am curious, how accurate are their machines, especially for oxygen? I posted recently about a finger monitor reading nice, except when I talked it went down, but then came right back up. Also it was steady 99, and it hit 100 at hospital after switching fingers mid-check where it hit a weird number and still read varying things swinging in the air. But the ambulance, the oxygen would stick 97-99 then it'd keep going low, then back up, then low, then back up. They told me that was inaccurate and likely from my hyperventilation, and moving around in a vehicle. My curiosity is if I can say 97-100 is accurate. Does oxygen go up and down like that, or would that be a matter just the ride with an ambulance? I think it's one of the only times they kept the sp02 on me the whole time. Doctor test came back with 6% under the threshold for CO2. Does this all point to hyperventilation and not a problem breathing? Sorry if it is somewhat a repeat question but, I just get kind of finnicky with the machines.