Shunt Equation Calculator

Shunt Equation Ratio:


About Shunt Equation Calculator (Formula)

The “Shunt Equation Calculator” is a tool used to determine the Shunt Equation Ratio, which represents the proportion of blood bypassing the lungs and not participating in gas exchange. The Shunt Equation Ratio is calculated by dividing the pulmonary physiologic shunt (Qs) by the cardiac output (Qt).

The Shunt Equation Ratio is a critical parameter in medicine, especially in the fields of respiratory physiology and critical care medicine. It is used to assess the adequacy of oxygenation in the body and to diagnose and monitor conditions such as cardiac failure, acute respiratory distress syndrome (ARDS), and other lung diseases.

The formula for the Shunt Equation Ratio is as follows:

SE = Qs / Qt


  • SE is the Shunt Equation Ratio
  • Qs is the pulmonary physiologic shunt (mL/min)
  • Qt is the cardiac output (mL/min)

The Shunt Equation Ratio can be used to assess the severity of disease, track the effectiveness of treatment, and guide decision-making in critically ill patients. It is an important tool for clinicians in providing appropriate care to patients with lung and heart conditions.

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