What can low oxygen levels measured by a pulse oximeter indicate?

Low oxygen levels measured by a pulse oximeter primarily indicate potential lung issues. The pulse oximeter is a non-invasive device that estimates the oxygen saturation level of the blood. When oxygen saturation falls below a normal range, it suggests that the lungs may not be adequately transferring oxygen to the bloodstream. This can occur due to various respiratory conditions, such as chronic obstructive pulmonary disease (COPD), asthma, pneumonia, or other situations where lung function is compromised.

In contrast, while potential heart problems or kidney deficiencies can also relate to oxygen delivery in the body, the primary and direct relationship observed through a pulse oximeter is with lung function. High blood sugar does not directly influence oxygen levels, making it less relevant in the context of oxygen saturation readings provided by a pulse oximeter.