Using the Henderson-Hasselbalch equation, determine the accuracy of the gas below. To be con-sidered accurate, it must be within 0.03 pH unit. pH = 7.22, PCO2 = 49 mm Hg, HCO3– = 20 mEq/L
a. This gas is completely accurate.
b. This gas is accurate as the calculated pH is 7.23.
c. This gas is accurate as the calculated pH is 7.20.
d. This gas is inaccurate according to the H-H equation.
ANS: B
Plugging the ABG values supplied into the H-H equation results in a pH of 7.33 which indicate the gas is accurate as the value should be within 0.03 of the recorded pH.
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