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Old 02-19-2020
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Default Repeated USMLE Questions Step 1- 307

A 32-year-old woman with a history of generalized anxiety disorder develops numbness of her face particularly around her mouth. Physical examination and x-ray show no abnormalities other than markedly increased respiratory rate.
Laboratory investigations are as follows:
PO2: 100 mmHg
PCO2: 30 mmHg
Bicarbonate: 18 mEq/L
pH of blood: 7.51
Which of these findings shows that the body is compensating to this condition?
A-Elevated arterial PO2
B-Elevated hydrogen ion concentration
C-Elevated hydrogen ion excretion
D-Elevated bicarbonate excretion
E-Elevated respiratory rate
Answer
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