What is Diffusing Lung Capacity (DLCO) and why is it important? 2026

This is a diagnostic method that provides critical information about breathing function and overall lung health.

The diffusing capacity of the lungs (or DLCO – Diffusing Capacity of the Lung for Carbon Monoxide) is a specialized pulmonary test that evaluates the ability of the lungs to transport oxygen from the air to the alveoli and finally to the blood. It is a diagnostic method that provides critical information on breathing function and overall lung health.

How is the DLCO exam done?

The examination is carried out using special equipment in a pulmonary laboratory. The patient breathes in a gas with a very low concentration of carbon monoxide (CO) and then exhales into an analyzer that measures how much of this gas has been absorbed by the body. The result indicates the ability of the lungs to exchange gases, and therefore, to oxygenate the blood.

When is it appropriate to measure the diffusing capacity of the lungs?

The measurement of DLCO is used in several cases, mainly for the diagnosis and monitoring of respiratory diseases such as:

• Chronic Obstructive Pulmonary Disease (COPD)

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• Pulmonary Fibrosis

• Sarcoidosis

• Pulmonary Hypertension

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• Rheumatic diseases involving the lungs

It is also used to assess the effect of smoking or exposure to toxic substances on the lungs.

What do DLCO results mean?

• A normal DLCO value indicates that the lungs are exchanging gases properly.

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• Low DLCO may indicate a limitation in oxygen exchange and indicate lung damage or reduced perfusion.

• Increased DLCO, although more rarely, can be seen in conditions such as polycythemia.

What is the importance of DLCO in the overall respiratory assessment?

diffusing lung capacity complements classic spirometric measurements and provides a more global picture of lung function. In patients with shortness of breath or chronic respiratory problems, it can reveal dysfunctions that are not detected by simple spirometry.

Where can I reliably measure DLCO?

For a reliable and scientifically based examination, you can visit the specialized pulmonary center Pneumocare, which provides advanced diagnostic services, including lung diffusion capacity (DLCO). See more here: ? Diffusing Capacity of Lungs DLCO – Pneumocare

Good lung health is the foundation for quality of life. If you have respiratory symptoms or belong to a high-risk group, a lung diffusing capacity test can be a valuable diagnostic tool.

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