A P50 measurement refers to which of the following?
a. The amount of oxygen diffusion in fluids
b. The PO2 when hemoglobin is 50% satu-rated with oxygen
c. The partial pressure of fetal hemoglobin at 50% saturation
d. The partial pressure of oxygen consumed by the oxygen electrode
ANS: B
P50 is a convenient way of describing hemoglobin affinity for oxygen because it identifies the PO2 in millimeters of mercury when hemoglobin is 50% saturated with oxygen.
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