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. Also included is one display visible to a person administering the spirometry to display clinically relevant parameters; a storage medium containing a pattern presentable to the test subject on an output medium to stimulate the test subject to cause air to flow through the sensor; and an output medium for presenting the pattern to the test subject; wherein the test subject, in a conscious effort to manipulate the pattern, repeatedly causes air to flow through the sensor; and wherein the pattern is designed to stimulate the test subject to cause the flow of air.
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