Enter the total pulmonary blood flow (L/min) and the total system blood flow (L/min) into the Calculator. The calculator will evaluate the Qp Qs Ratio. 

Qp Qs Ratio Formula

QpQs = PBF / SBR

Variables:

  • QpQs is the Qp Qs Ratio ()
  • PBR is the total pulmonary blood flow (L/min)
  • SBR is the total system blood flow (L/min)

To calculate Qp Qs Ratio, divide the pulmonary blood flow by the system blood flow.

How to Calculate Qp Qs Ratio?

The following steps outline how to calculate the Qp Qs Ratio.

  1. First, determine the total pulmonary blood flow (L/min). 
  2. Next, determine the total system blood flow (L/min). 
  3. Next, gather the formula from above = QpQs = PBF / SBR.
  4. Finally, calculate the Qp Qs Ratio.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total pulmonary blood flow (L/min) = 4

total system blood flow (L/min) = 6