Spo 2 normally is around 98 percent .if less u should get a chest x Ray done and visit a pulmonologist for the same. Any finger can be used ..index finger is usually reliable. Nail should not be having any nail paint. Keep it for a minute n take reading..
I have always had Trop I levels around 1-1.5 ( all measured in pg/ml, normal reading in my Lab is below 3
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