System and method for determining pulmonary function characteristic

A device for determining at least one pulmonary function characteristic, the device constituted of: a main chamber; a first pressure sensor for measuring pressure within the main chamber; a shutter module; a control unit configured to switch the shutter module between a first state presenting a distal opening of the main chamber with a first effective area, and a second state presenting the distal opening with a second effective area; a sampling chamber; a second pressure sensor for measuring pressure within the sampling chamber; at least one gas sensor for sensing a concentration of a respective gas within the sampling chamber; a pump; a first valve positioned between the main chamber and the sampling chamber; and a second valve positioned between the sampling chamber and the pump, the control unit configured to control the second valve to switch the second valve between an open state and a closed state.