If u read my first post, i explained that the fingertip pulse oximeter is for COPD patient monitoring.

As for interpreting the results , it would depend on some research, doctor consulation and obviously a device to monitor the readings in the first place. Without the device, obviously one cannot possibly know the SPO2 level.  No one is born with knowledge, its a matter of whether u want to pursue it or not. Being proactive in understanding one's health is better than sit and pray for the best.

As for ur comment on the instance of cough, temporary spike in readings would NOT be of concern as long as it returns to normal, but prolong low level would require further investigation / seeking medical help especially if other symptoms of oxigen deficiency is exhibited.