Thanks for the further information.
Few points are important here;
1) Pulse oximetry is interpreted in the context of symptoms. If you do not have breathlessness on rest or on exertion, there is nothing to worry;; as your other investigations are normal.
2) If you have symptoms; you need to get blood gas analysis, which is far sensitive test for oxygen and carbon dioxide carrying by the blood.
3) Pulse oximetry estimates blood oxygen from the capillary flow. Sometimes probes are nor properly functioning or the skin is thick or scarred, they may give slightly low reading. In that case too; blood gas analysis is needed for the further confirmation.
If you have any known lung issues, significant family history or are smoker; you may high resolution CT scan, if not yet done.
It is privilege assisting you.
Please let me know if you have further queries or unanswered questions.
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Wishing you all the very best in life.