A patient has a P50 value of 29 mm Hg. What does this indicate?
a. Decreased affinity of Hb for O2
b. Higher than normal Hb saturation for a given PO2
c. Increased affinity of Hb for O2
d. Normal position in the HbO2
ANS: A
Conditions that cause a decrease in Hb affinity for O2 (a shift of the HbO2 curve to the right) in-crease the P50 to higher than normal. A normal P50 is 26 mm Hg.
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