What would be a normal P50 for a fetus?
a. 10
b. 15
c. 20
d. 25
ANS: C
Figure 9-6 illustrates how the increased O2 affinity is manifested by a leftward shift of the fetal oxyhemoglobin dissociation curve. The P50 (PO2 that saturates 50% of the hemoglobin) is 6 to 8 mm Hg less than adult hemoglobin (HbA), which indicates the degree of the shift toward higher affinity.
Health Professions
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