What is oximetry?
Pulse oximetry is a non-invasive method for monitoring a person’s oxygen saturation (SO2). Though it’s reading of So2 is not always identical to the more desirable reading of SaO2 from arterial blood gas analysis, the two are correlated well enough that the safe, convenient, non-invasive, inexpensive pulse oximetry method is valuable for measuring oxygen saturation in clinical use.
How is oximetry done?
This is done exploitation AN measuring instrument, a photoelectrical device specially designed for this purpose. A reusable probe are often placed on the finger or one use tape probe is placed on the lobe or finger.
What are pulse oximeters?
The oximeters most typically used nowadays are known as pulse oximeters as a result of they respond only to pulsations, like those in pulsing capillaries of the area tested.
How common are oximeters?
Oximeters area unit currently a virtual fixture in medical care units, pulmonic units and elsewhere in hospitals and healthcare facilities.
How does a pulse oximeter function?
A pulse oximeter works by passing a beam of red and infrared through a rhythmical capillary bed. The magnitude relation of red to infrared blood lightweight transmitted provides a live of the oxygen saturation of the blood. The oximeter works on the principle that the oxygenated blood is a brighter color of red than the deoxygenated blood, that is additional blue-purple. First, the oximeter measures the add of the intensity of each reminder red, representing the fractions of the blood with and without oxygen. The oximeter detects the heartbeat, then subtracts the intensity of color detected once the heartbeat is absent. The remaining intensity of the color represents solely the oxygenated red blood. this is often displayed on the electronic screen as a share of oxygen saturation within the blood.