Which of the following best describes an oxygen saturation value?
a. The partial pressure of the oxygen in the blood
b. The percentage of hemoglobin that is saturated with oxygen
c. The amount of oxygen saturating the lymphocytes
d. The percentage of oxygen in the lungs
ANS: B
Oxygen saturation measures the percentage of hemoglobin that is saturated with oxygen, not the percent of oxygen in the lungs. The partial pressure of oxygen describes a blood gas, not saturation. Oxygen does not saturate lymphocytes.
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