Expected pH (for chronic change in pCO2)
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PaCO2
unit mmHg Kpa
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Expected pH
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Expected pH (for chronic change in pCO2)

For every 10 mmHg the pCO2 is chronically elevated, pH is expected to decrease by 0.03

For every 10 mmHg the pCO2 is chronically decreased, pH is expected to increase by 0.03

pH expected = 7.40 - 0.003*(pCO2-40)

Reference:

Doyle DJ. A Synopsis of Acid-Base Analysis. http://acidbase.homestead.com/ABG_Analysis_Rev_2.0.pdf. Update Jan 2006. Last assessed June 2013