Which of the following is the normal alveolar-to-arterial difference for a 56-year-old female in the emergency department?
a. 12 mm Hg
b. 14 mm Hg
c. 16 mm Hg
d. 18 mm Hg
ANS: D
[P(A–a)O2] = (age/4) + 4
[P(A–a)O2] = (56/4) + 4
[P(A–a)O2] = 18 mm Hg
Health Professions
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