Pulmonary Shunt Calculation

Pulmonary Shunt Ratio is a physiological condition, in which alveoli of the lungs perfuse blood as-usual, but the ventilation fails. Perfusion or ventilation ratio turns zero when there is no supply of air reaching the alveoli. Use this simple online Qs/Qt ratio calculator to perform pulmonary shunt calculation. This shunt ventilation calculator does the calculation based on oxygen content in pulmonary end capillaries, arterial and mixed venous blood.

Qs/Qt Ratio Calculator | Shunt Ventilation Calculator

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Qs/Qt(Fraction) = ( C - A ) / ( C - V ) Qs/Qt(%)= (( C - A ) / ( C - V )) × 100 Where, P = Pulmonary shunt ratio C = Oxygen content in pulmonary end capillary A = Oxygen content in arterial V = Oxygen content in mixed venous blood


Calculate the pulmonary shunt ratio with the oxygen content in pulmonary end capillarys of 20 ml/L, the oxygen content in arterial of 35 ml/L and oxygen content in the mixed venous blood of 60 ml/L.


Qs/Qt ratio = ( ( 20 - 35 ) / ( 20 - 60 ) ) × 100
= ( -15 ) / (-40 ) x 100
=0.375 x 100
= 37.5 %

Note :This statistics calculator is presented for your own personal use and is to be used as a guide only. Medical and other decisions should NOT be based on the results of this calculator. Although this calculator has been tested, we cannot guarantee the accuracy of its calculations or results.

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