Lung Function Test After filling in a medical questionnaire, the lung function screening test will be carried out using a computerised spirometer. Four classifications are used for the lung function screening tests: "within normal limits" "obstructive" : Means that the employee has airways obstruction caused by conditions including bronchitis, asthma (occupational or non-occupational), emphysema, etc. "restrictive" : This classification indicates that the employee may be suffering from diseases affecting the ribs or the vertebral column, the tissue of the lung, or be due to normal physiology. "combined" : An employee who is classified as combined is both "obstructive and restrictive". Those employees who are found to be classified as obstructive, restrictive or combined must fill in another, more detailed questionnaire. The results of the test, along with the completed questionnaire, will be shown to the occupational health physician. He will analyse the data and write to the employee's family doctor with his findings. The employee must make an appointment with his/her family doctor, for a more detailed examination. provide this referral service at no additional cost. An employee failing the test may be issued with a peak flow meter for further monitoring. This enables the occupational health physician to gain a more detailed insight into the employee's medical condition. The company will be advised of the situation and will supervise and co-ordinate all correspondence between the occupational health physician and the employee's family doctor. offer this service free of charge. The lung function screening test should be carried out annually. However, where an employee has been classified as obstructive, restrictive or combined or the employees are working in a high risk environment, it is recommended that the lung function screening tests are carried out at six monthly intervals. A full list of the substances that may cause occupational asthma can be supplied on request.