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.

- First, determine the total pulmonary blood flow (L/min).
- Next, determine the total system blood flow (L/min).
- Next, gather the formula from above = QpQs = PBF / SBR.
- Finally, calculate the Qp Qs Ratio.

**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