Can you have an oxygen saturation of 99 percent and still have lung cancer?

Yes, it is possible to have an oxygen saturation of 99 percent and still have lung cancer. Oxygen saturation measures the percentage of hemoglobin in the blood that is saturated with oxygen, which can be normal even in the presence of lung cancer, especially in early stages or if the cancer is not significantly affecting lung function. Other factors, such as the type and location of the cancer, overall health, and presence of other respiratory conditions, can influence lung function and oxygen levels. Regular medical evaluations are essential for those with lung cancer, even if oxygen saturation appears normal.