Dear sir/madam Recently i check my sister sp02 readin and it shows 93% .i have check it multiple times and on my readin it says 98%. But we were just checking it for no reason and found out its below 95% (normal limit) for her. Should we be concern ? As she is feeling completely normal . Please let me know if i should get her tested or its normal to have those readin or am i doing incorrectly. Thank you so much in advance.