All about  Pulse Oximeter

Pulse oximeter is one of the most commonly employed monitoring device in the critical care setup. It is important device for respiratory monitoring. 


Need of  Pulse Oximeter

Most people do not need normally, though during the COVID-19 pandemic, many people are using them to check their oxygen levels. 


Hemoglobin (Hb) and oxygenated hemoglobin (HbO2) differ in their absorption of red and infrared light. 

The volume of arterial blood in tissue and therefore light absorption by the hemoglobin changes during the pulse. 

How Pulse Oximeter Work

Device have red and infrared low voltage light emitting diodes (LED) witch serve as light sources. The emitted light is transmitted through the tissue. 

Later collected by the photodetector, converted into digital signals and sent to the microprocessor of the device. 

Clinical application

This increase patient safety by alerting the hospital staff to the onset of hypoxia during or following surgery.

Oximeter  Vs  arterial blood gas

An oximeter indirectly measures the amount of oxygen that is carried by your blood. It does not measure the carbon dioxide level in the blood flow.