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An oxygen saturation of 93% is acceptable but needs to be checked from time-to-time because if it falls below 90, oxygen supplementation may be needed. Also, it demends on the person's medical history. For example, if the patient has a history of a disease such as COPD criteria for acceptability may be different. Medical consultation may be needed. Never make medical decisions base primarily on infomration found in sources such as this web site. Always consult a qualified medical professional, who can consider all aspects of the person's condition and medical history.
You have Iron atoms in hemoglobin. This atom is the binding site for oxygen in case of hemoglobin.
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