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Currently available oximeters utilize __________ wavelengths.

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Currently available oximeters utilize __________ wavelengths.

(a) Equal to 2

(b) Cannot be determined

(c) Less than 2

(d) More than 2

This question was addressed to me during an online interview.

Question is taken from Biotelemetry in division Biomedical Telemetry of Biomedical Instrumentation

1 Answer

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Correct answer is (d) More than 2

Easiest explanation: Currently available fiber-optic oximeters utilize more than two wavelengths to adjust for haematocrit variation. For estimating SO2, usually the reflectance at two wavelengths, one in the red and the other in the near infrared regions, are used.

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