BiLab provides a method to quantify how much blood is pumped out of the heart. Using a multi-channel impedance plesthysmography technology, noninvasive continuous bedside monitoring of cardiac blood flow is possible. Capturing fast changes in cardiac blood flow using electrode pads around the chest, stroke volume and cardiac output signals are acquired. Beat-to-beat measurements of stroke volume can facilitate the fluid challenge, passive leg rasing, and end-expiratory occlusion tests to determine preload responsiveness. The noninvasive device can continuously monitor stroke volume and other hemodynamic parameters throught the entire fluid management process.