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What is the wavelength of the red LED in pulse oximetry?(a) 660 nm(b) 740 nm(c) 905 nm(d) 950 nmThis question was addressed to me in unit test.This key question is from Pulse Oximeter in portion Oximeters of Biomedical Instrumentation

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Right answer is (a) 660 nm

Best explanation: Pulse OXIMETRY is a particularly CONVENIENT noninvasive measurement method. Typically it UTILIZES a pair of small light-emitting diodes (LEDS) FACING a photodiode through a translucent part of the patient’s body, usually a fingertip or an earlobe. One LED is red, with a wavelength of 660 nm, and the other is infrared, 905, 910, or 940 nm.



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