Physiologic Shunt Equation Calculator

Calculates physiologic shunt fraction from end-capillary, arterial, and mixed venous oxygen content.

Inputs

End-capillary oxygen content, CcO₂ mL/dL

Arterial oxygen content, CaO₂ mL/dL

Mixed venous oxygen content, CvO₂ mL/dL

Equation:

Solving steps:

CcO₂ − CaO₂

—

mL/dL

CcO₂ − CvO₂

—

mL/dL

Qsp/Qt

—

Normal/reference: Physiologic shunt Qsp/Qt normal is listed as <10%.

The physiologic shunt equation compares end-capillary, arterial, and mixed venous oxygen contents.

It estimates the fraction of cardiac output that bypasses effective gas exchange.

Reliable use requires oxygen contents from compatible conditions and valid CcO₂, CaO₂, and CvO₂ estimates.

Attached equations reference supplied by the user for calculator equation confirmation.