USMLE-Rx Step 1 Qmax Challenge #1610

Check out today’s Step 1 Qmax Question Challenge.

Know the answer? Post it below! Don’t forget to check back for an update with the correct answer and explanation (we’ll post it in the comments section below).

A 65-year-old patient comes in for an insurance physical that requires pulmonary function tests to ensure he does not have underlying restrictive or obstructive lung disease before the insurance company will cover him. The patient has a 55-pack-year history of smoking. Laboratory testing reveals an arterial carbon dioxide pressure of 40 mm Hg and an expired air carbon dioxide pressure of 30 mm Hg. His physiologic dead space is determined to be 125 mL.

What is the patient’s tidal volume?

A. 50 mL
B. 100 mL
C. 250 mL
D. 500 mL
E. 1000 mL
F. 2500 mL


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