Question

A 35-year-old presents with cough, fever, pleuritic pain; CXR shows lobar consolidation. ABG on room air: pH 7.47, PaCO2 32, PaO2 68. A-a gradient is approximately (assume FiO2 0.21, PaCO2 32):

Accepted Answer

40 mm Hg

Answer

10 mm Hg

Answer

25 mm Hg

Answer

60 mm Hg

Answer

>100 mm Hg

Practice question

A 35-year-old presents with cough, fever, pleuritic pain; CXR shows lobar consolidation. ABG on room air: pH 7.47, PaCO2 32, PaO2 68. A-a gradient is approximately (assume FiO2 0.21, PaCO2 32):