European best practice guidelines for cystic fibrosis neonatal screening

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Abstract

There is wide agreement on the benefits of NBS for CF in terms of lowered disease severity, decreased burden of care, and reduced costs. Risks are mainly associated with disclosure of carrier status and diagnostic uncertainty. When starting a NBS programme for CF it is important to take precautions in order to minimise avoidable risks and maximise benefits.

In Europe more than 25 screening programmes have been developed, with quite marked variation in protocol design. However, given the wide geographic, ethnic, and economic variations, complete harmonisation of protocols is not appropriate. There is little evidence to support the use of IRT alone as a second tier, without involving DNA mutation analysis. However, if IRT/DNA testing does not lead to the desired specificity/sensitivity ratio in a population, a screening programme based on IRT/IRT may be used.

Sweat chloride concentration remains the gold standard for discriminating between NBS false and true positives, but age-related changes in sweat chloride should be taken into account. CF phenotypes associated with less severe disease often have intermediate or normal sweat chloride concentrations. Programmes should include arrangements for counselling and management of infants where the diagnosis is not clear-cut.

All newborns identified by NBS should be managed according to internationally accepted guidelines. CF centre care and the availability of necessary medication are essential prerequisites before the introduction of NBS programmes.

Clear explanation to families of the process of screening and of implications of normal and abnormal results is central to the success of CF NBS programmes. Effective communication is especially important when parents are told that their child is affected or is a carrier. When establishing a NBS programme for CF, attention should be given to ensuring timely and appropriate processing of results, to minimise potential stress for families.

Abbreviations

CDC
Center for Disease Control (Atlanta USA)
CF
cystic fibrosis
CFTR
Cystic Fibrosis Transmembrane Conductance Regulator
ECFS
European Cystic Fibrosis Society
EQA
European Quality Assistance
EuroCareCF
European Coordination Action for Research in Cystic Fibrosis
IRT
immunoreactive trypsinogen
NBS
newborn screening
PAP
pancreatitis associated protein
RCT
randomized controlled trial
RSV
Respiratory Syncytial Virus

Keywords

Cystic fibrosis
Neonatal screening
Diagnosis
Immunoreactive trypsinogen
Sweat test

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