Diffusing capacity

Diffusing capacity or DLCO is a medical term that refers to the lung's ability to transfer gases from the air in the lungs to the red blood cells in lung blood vessels. It is an important aspect of the respiratory system's function and is often measured in pulmonary function tests.

Overview

The diffusing capacity of the lungs for carbon monoxide (DLCO) is a test that measures how well oxygen and other gases can move from the lungs into the blood. This test is often used to diagnose and monitor diseases that affect the lungs, such as chronic obstructive pulmonary disease (COPD), asthma, and pulmonary fibrosis.

Procedure

The DLCO test is usually performed in a hospital or clinic. The patient breathes into a machine that measures the amount of gas in the air they exhale. The machine then calculates the diffusing capacity of the lungs.

Interpretation

A low DLCO can indicate a problem with the lungs' ability to transfer gases. This could be due to a number of conditions, including emphysema, pulmonary fibrosis, or pulmonary hypertension. A high DLCO can indicate a condition where the lungs are overfilled with blood, such as polycythemia or left heart failure.

See also

• Pulmonary function test
• Respiratory system
• Lung diseases

References

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