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Calculated PaCO2
Aka: Calculated PaCO2, Winter's Formula
- Calculation: Calculated PaCO2 in Respiratory Conditions
- Increase PaCO2 by 10 mmHg
- Acute Respiratory Acidosis: decreases pH 0.08
- Chronic Respiratory Acidosis: decreases pH 0.03
- Decrease PaCO2 by 10 mmHg
- Acute Respiratory Alkalosis: increases pH 0.08
- Chronic Respiratory Alkalosis: increases pH 0.03
- Calculation: Calculated PaCO2 in Metabolic Conditions
- Metabolic Acidosis with expected compensation
- PaCO2 = 1.5 x HCO3 + 8 (+/- 2)
- PaCO2Delta = 1.2 x BicarbDelta
- PaCO2 will not typically drop below 10 mmHg in respiratory compensation
- Metabolic Alkalosis with expected compensation
- PaCO2 = 0.7 x HCO3 + 20 (+/- 1.5)
- Interpretation: Elevated Anion Gap Metabolic Acidosis
- Measured PaCO2 > Calculated PaCO2
- Metabolic Acidosis with Respiratory Acidosis
- Measured PaCO2 < Calculated PaCO2
- Metabolic Acidosis with Respiratory Alkalosis
- Resources
- Calculate pCO2 from pH and Bicarbone (Refactored Henderson-Hasselbach to solve for pCO2 instead of pH)
- HendersonHasselbachReversed.html