Abstract: A system for administering spirometry co-operative a test subject having limited comprehension capacity. The system includes a measuring sensor for measurement of a flow of air moving therethrough and one or more PID-controllers for evaluating the measurement of the flow of air. The system also includes a processor to co-ordinate actions of components to process data pertaining to evaluation of the measurement of the flow of air, and translate the measurement of the flow of air to clinically relevant parameters.