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How many wavelengths are utilized by currently available oximeters?(a) More than 2(b) Less than 2(c) Equal to 2(d) Cannot be determinedThis question was addressed to me during an interview.Origin of the question is Biofeedback Instrumentation in chapter Biomedical Recorders of Biomedical Instrumentation

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Right CHOICE is (a) More than 2

The best explanation: For estimating SO2, usually the reflectance at two wavelengths, one in the RED and the other in the near infrared REGIONS, are used. CURRENTLY available fiber-optic oximeters utilize more than two wavelengths to adjust for haematocrit variation.



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