Newborn screening for cystic fibrosis.

Area of Science:

• Medical Genetics
• Pediatric Pulmonology
• Public Health Screening

Background:

• Newborn screening for cystic fibrosis (CF NBS) is widely implemented in Western countries.
• Early identification of cystic fibrosis (CF) is crucial for timely intervention and improved outcomes.
• CF NBS aims to detect the disease before clinical symptoms manifest.

Purpose of the Study:

• To review the evidence supporting the benefits of CF NBS.
• To describe various screening algorithms used globally.
• To address challenges associated with false-negative and false-positive screening results, and inconclusive diagnoses.

Main Methods:

• Literature review of existing evidence on CF NBS.
• Analysis of different jurisdictional screening algorithms.
• Examination of data on outcomes for screened newborns, particularly those with inconclusive sweat tests.

Main Results:

• CF NBS has become a standard practice, identifying most CF cases presymptomatically.
• Diverse screening algorithms are employed, each with unique advantages and limitations.
• False-negative and false-positive results pose significant challenges in CF NBS implementation.
• A subset of newborns screened positive for CF receive inconclusive results from confirmatory sweat testing.

Conclusions:

• CF NBS is effective in early detection of cystic fibrosis.
• Standardization of screening algorithms and clear protocols for managing inconclusive results are needed.
• Further research is required to optimize CF NBS protocols and address diagnostic uncertainties.