Detecting Heart Issues With Pulse Oximeter
A pulse oximeter accurately measures the oxygen saturation in the blood. People with mild to moderate heart failure can have normal to modestly lower blood saturation levels at rest. However, their blood oxygen saturation levels will markedly drop when presented with physical activity. And people with severe heart failure will have dramatically lower oxygen saturation at rest. (Source)
Low blood oxygen saturation does not conclusively dictate one has cardiac issues. Low oxygen levels can be a sign of lung issues such as COPD. Low oxygen levels can be an early warning sign for pneumonia (CLICK HERE to see video on this topic).
When using a pulse oximeter, it is important to establish a baseline measurement. Then you will know when your SpO2 levels are different from your baseline. It is also important to be consistent when taking your measurements and making sure not to inadvertently lower your readings. (CLICK HERE to read article about best way to use a pulse oximeter)
If you frequently measure low blood oxygen saturation levels, consult your doctor for further guidance.