[Follow-up protocol of patients with cystic fibrosis diagnosed by newborn screening].

Newborn screening (NBS) for cystic fibrosis (CF) is well-established in many countries and provides the opportunity for an early diagnosis and treatment before the development of irreversible structural lung damage. In 1999, Catalonia, Castilla-León, and the Balearic Islands started the NBS programme for CF. In the last 10 years its implementation rapidly spread and all the autonomies offer the NBS programme for CF since 2015. There are many different strategies across Spain. It is believed that it is very opportune to have an updated and consensual guide for the diagnosis, follow-up, and treatment of patients diagnosed by neonatal screening.