Spirometer test for lung function
Asthmatic man breathes heavily into a spirometer in a lung-function test which measures the total air exhaled. The test is being carried out at the National Heart & Lung Institute, London, under the supervision of a doctor.
Copyright © James King-Holmes
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Photo size: 17.3 Mpixels (49.4 MB uncompressed) - 4800x3600 pixels (16.0x12.0 in / 40.6x30.5 cm at 300 ppi)