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Cystic fibrosis (CF) is the most common inherited life-limiting disorder among Caucasians. The implementation of CF newborn screening has enabled early diagnosis and prompt treatment onset. However, several factors may affect circulating levels of immunoreactive trypsinogen leading to a normal CF newborn screen. This case aims to highlight the importance of taking clinical manifestations as a strong factor for the diagnosis of CF even in the presence of a negative newborn screen. This may allow early referral to a specialized CF center where the onset of appropriate treatment can be implemented, thereby positively impacting the course of the disease.

Later Diagnosis of Cystic Fibrosis with Negative Newborn Screen: Importance of the Clinical Picture