In a piece of research run at the Paediatric Service of the Hospital Universitario Donostia, Dr Paula Corcuera-Elosegui, assistant consultant in Infant Pneumology, has studied the validity of the exhaled nitric oxide measurement as a complementary procedure in diagnosing and monitoring treatment for childhood asthma and overseeing the condition. She not only confirmed the usefulness of the test, she was able to develop a technique to apply it in breast-fed babies.