A patient with a bilirubin level of 28 mg/dL has arterial blood drawn for CO-oximetry. The res-piratory therapist should expect a(n) _____ measurement
a. Accurate O2Hb c. Higher-than-actual O2Hb
b. Lower-than-actual O2Hb d. Higher-than-actual HbCO
ANS: B
The presence of bilirubin in quantities greater than 20 mg/dL of whole blood can alter measure-ments because it absorbs near-infrared (IR) and IR light. Absorbance of light by bilirubin lowers the actual O2Hb measured.
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