Skin gas analysis (partial pressure of gases in exhaled breath)

What Does This Test Measure?

Your breath sample is analyzed for key gases, including carbon monoxide (CO), nitrogen oxides (NO), and other biomarkers. These gases reflect lung ventilation, oxygen exchange, and metabolic processes. The test often includes partial pressures of oxygen (pO₂), carbon dioxide (pCO₂), and potentially other gases like methane or hydrogen sulfide, depending on clinical focus. Results may be compared to baseline or reference values specific to your health status.

How Is the Test Performed?

You will exhale into a specialized breath collection device for a few minutes. The device captures and analyzes the gases in your exhaled air. No fasting or special preparation is typically required, but follow any specific instructions your healthcare provider gives you. The test is usually quick and painless.

Why Might This Test Be Ordered?

Your doctor may recommend this test to evaluate lung function, detect metabolic disorders, or monitor conditions like chronic obstructive pulmonary disease (COPD), cystic fibrosis, or diabetes. It can also help assess exposure to environmental toxins or identify abnormalities in lung ventilation.

What Are Common Findings?

Abnormal gas levels may indicate issues such as poor lung function, metabolic imbalances, or infections. For example, elevated carbon dioxide levels might suggest hyperventilation or respiratory obstruction, while unusual nitrogen oxide levels could point to inflammation or infection in the lungs.