What are the two wavelengths of light used to determine hemoglobin saturation with a pulse oximeter?
a. 550 nm and 730 nm c. 730 nm and 940 nm
b. 660 nm and 940 nm d. 550 nm and 840 nm
ANS: B
O2Hb and deoxygenated hemoglobin (HHb) are differentiated by shining a light with 660-nm and 940-nm wavelengths through the sampling site.
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