![]() The LEDs blink about 30 times per second. Deoxygenated hemoglobin allows more infrared light to pass through and absorbs more red light. Oxygenated hemoglobin absorbs more infrared light and permits more red light to pass through. One LED is red with a wavelengthof 660nm, and the other is infrared with a wavelength of 940nm.Ībsorption of light at these wavelengths differs greatly between blood loaded with oxygen and blood deficient of oxygen. ![]() Normally, it employs a processor and a pair of small light-emitting diodes (LEDs) facing a photodoide through a translucent part of the patient’s body, usually a fingertip or an earlobe. This apparatus must be clipped onto those body parts, which enable light to pass through the blood flowing in the arteries. It is used for the detection of hypoxia, a condition in which the body or a region of it is deprived of adequate oxygen supply. This instrument was designed to monitor the inability of oxygen intake by the body. For best and accurate results, the readings must be tallied with a person’s respiratory rate. This device also displays a calculated heart rate. Hemoglobin in the blood is the carrier of oxygen.Įach gram of hemoglobin can carry 1.34 milliliters of oxygen. The monitoring unit shows a digital percentage readout of a calculated estimate of the patient’s hemoglobin (Hgb) that is saturated with peripheral oxygen (SpO 2). A pulse oximeter is a small box-like device which consists of a computerized monitor and probe that can be connected to the patient’s finger, toe, nose, or earlobe.
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