A gas transfer test evaluates your lungs' ability to absorb oxygen from the air you inhale. The outcome of this test is referred to as the transfer factor, alternatively known as the diffusing capacity.
What’s it used for?
A gas transfer test serves as a diagnostic and monitoring tool for lung conditions like COPD and pulmonary fibrosis. Additionally, it may be employed to assess lung function before surgery or to observe how the lungs respond during chemotherapy.
What happens during a gas transfer test?
You breathe in a mixture of air containing minute quantities of helium and carbon monoxide (CO), both of which are completely safe at the low levels used in the test. With a nose clip in place, you'll be prompted to take a deep breath through a mouthpiece, followed by holding your breath and exhaling steadily into the machine. This sequence may be repeated multiple times, with short breaks in between attempts. Don't worry if it takes a few tries to achieve a reliable result.
Preparing for the test
Smoking can influence the results; therefore, if you are a smoker, refrain from smoking for 24 hours before undergoing the test.
What will the results look like?
The gas transfer test informs your consultant about the efficiency of oxygen exchange from the lungs into the bloodstream. Result interpretation takes into account factors such as age, height, gender, ethnicity, and the level of haemoglobin in your blood.
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