Nephrology Book

//fpnotebook.com/

Calculated PaCO2

Aka: Calculated PaCO2, Winter's Formula
  1. Calculation: Calculated PaCO2 in Respiratory Conditions
    1. Increase PaCO2 by 10 mmHg
      1. Acute Respiratory Acidosis: decreases pH 0.08
      2. Chronic Respiratory Acidosis: decreases pH 0.03
    2. Decrease PaCO2 by 10 mmHg
      1. Acute Respiratory Alkalosis: increases pH 0.08
      2. Chronic Respiratory Alkalosis: increases pH 0.03
  2. Calculation: Calculated PaCO2 in Metabolic Conditions
    1. Metabolic Acidosis with expected compensation
      1. PaCO2 = 1.5 x HCO3 + 8 (+/- 2)
      2. PaCO2Delta = 1.2 x BicarbDelta
      3. PaCO2 will not typically drop below 10 mmHg in respiratory compensation
    2. Metabolic Alkalosis with expected compensation
      1. PaCO2 = 0.7 x HCO3 + 20 (+/- 1.5)
  3. Interpretation: Elevated Anion Gap Metabolic Acidosis
    1. Measured PaCO2 > Calculated PaCO2
      1. Metabolic Acidosis with Respiratory Acidosis
    2. Measured PaCO2 < Calculated PaCO2
      1. Metabolic Acidosis with Respiratory Alkalosis

You are currently viewing the original 'fpnotebook.com\legacy' version of this website. Internet Explorer 8.0 and older will automatically be redirected to this legacy version.

If you are using a modern web browser, you may instead navigate to the newer desktop version of fpnotebook. Another, mobile version is also available which should function on both newer and older web browsers.

Please Contact Me as you run across problems with any of these versions on the website.

Navigation Tree