Spirometry/ Lung function Testing When you attend your outpatient appointment you may be asked to carry out a lung function test. Lung function tests measure how well your lungs are working. . You will be taken to the lung function room which has all the special lung function testing equipment in. The cubicle that you will be asked to sit in looks a bit like a shower cubicle. The respiratory technician will then explain how the test is carried out and give you the chance to have a practice at blowing through the filter. After your practice blow you will be asked to sit in the cubicle and carry out the test. You will be asked to blow out as fast and as long as you can There are some incentive games to play while the test is being carried out. The test will not take long and we aim to make them as fun as possible.