Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.
If you mean one of those finger pulse oximeters----- I have one. I think I only paid around $30 for it---- and the brand is the same one my doctor's office uses.
The only thing is---- I remember reading here that one or two people have said that even as they were in the ER for a PE their pulse ox was 'normal'. I don't know what to make of that.
Wiki says:
"Pulse oximetry measures solely oxygenation, not ventilation and is not a complete measure of respiratory sufficiency."----- if that clears things up for you.
http://en.wikipedia.org/wiki/Pulse_oximetry#Limitations