How to Calculate Classic Shunt

Classic Shunt Equation: Qs/Qt = ((CcO2 – CaO2) / (CcO2 – CvO2)) * 100

Indicator or efficiency of pulmonary system:

  • < 10% = normal lungs
  • 10-20% = minimal effect
  • 20-30% = significant pulmonary disease
  • > 30% = life-threatening
CcO2: Capillary oxygen content in Vol% (mL O2/dL blood):
CaO2: Arterial oxygen content in Vol% (mL O2/dL blood):
CvO2: Mixed venous oxygen content in Vol% (mL O2/dL blood).
Shunt %

Qs/Qt normal less than 10%

How to calculate Classic Shunt

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