QP/QS Calculator

Online calculator for precise calculations of Pulmonic Blood Flow, Systemic Blood Flow, and QP/QS ratio effortlessly.

QP/QS estimation is crucial for patients with intra-cardiac or extra-cardiac shunts, determined through 2-D echo and spectral Doppler measurements. Our QP/QS Calculator focuses on left-to-right shunting, assessing Pulmonary Systemic Flow Ratios via conventional and simplified Doppler methods.

RVOT Subvalvular Velocity Time Integral
cm
Right Ventricular Outflow Tract Diameter
cm
LVOT Subvalvular Velocity Time Integral
cm
Left Ventricular Outflow Tract Diameter
cm
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    4 Number of calculations
    \text{Pulmonic Blood Flow} = r \times \pi \times \left(\frac{v}{2}\right)^2 \text{Systemic Blood Flow} = l \times \pi \times \left(\frac{t}{2}\right)^2 \text{Pulmonary-Systemic Flow Ratio} = \frac{\text{Pulmonic Blood Flow}}{\text{Systemic Blood Flow}}

    Where,

    • r = RVOT Subvalvular Velocity Time Integral
    • v = Right Ventricular Outflow Tract Diameter
    • l = LVOT Subvalvular Velocity Time Integral
    • t = Left Ventricular Outflow Tract Diameter