pulse/ox machine for shortness of breath

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after reading a post on this forum about a lady who was experiencing similar symptoms as I am with shortness of breath I bought a small pulse and oxygen reader that fits on your finger in hopes that I could get somemy oxygen levels. I took it a few times as I was coming out of Walmart it was hot outside and I was pushing a heavy cart and it read 92 I took it again once I was sitting for a few minutes and it shot back up to 98 and that's pretty much where it has stayed. I feel out of breath and like breathing through my nose isn't fulfilling getting enough oxygen into my lungs and so every second or third breath through my noseI am taking a large breath through my mouth. my question is does this oxygen reader tell you how much oxygen is going to your bloodstream or how much oxygen is in your lungs at that certain time because I know there are some problems one of which I do have where I produce too much iron that can cause shortness of breath and so would it show a low oxygen level if it had to do with my iron levels being too high or would it only show a pulmonary reason for oxygen levels to be low? I know this is a strange question I am just trying to get to the bottom of all of this.

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    I'm REALLY HAPPY that you're feeling better. If things get out of hand again, we're all here to help.

    Love Tess

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