Approximate the corresponding saturation for a PaO2 of 80 mm Hg under normal acid-base con-ditions by using the oxyhemoglobin dissociation curve in the figure
a. 80% c. 90%
b. 85% d. 95%
ANS: D
Find 80 mm Hg on the x-axis of the oxyhemoglobin dissociation curve, and draw a straight ver-tical line up to the dissociation curve. Then from that point, draw a horizontal line across to the y-axis. That will give the saturation.
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