If the PCO2 of an arterial blood sample is 60 mm Hg, the expected pH is:
a. 7.20. c. 7.50.
b. 7.30. d. 7.60.
ANS: A
The pH changes by 0.1 unit for every 10-mm Hg increase in PCO2. Therefore, a PCO2 of 60 mm Hg is 20 mm Hg higher than normal, which equates to 2 ? 0.1 = 0.2 decrease in pH from normal, or 7.40 – 0.2 = 7.20.
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