U.S. National Library of Medicine
Plethysmographic determination in which the intensity of light reflected from the skin surface and the red cells below is measured to determine the blood volume of the respective area. There are two types, transmission and reflectance.
The numerical value of photoplethysmography in Chaldean Numerology is: 1
The numerical value of photoplethysmography in Pythagorean Numerology is: 3
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"photoplethysmography." Definitions.net. STANDS4 LLC, 2017. Web. 26 Apr. 2017. <http://www.definitions.net/definition/photoplethysmography>.