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. 2020 Dec;28(12):1631-1644.
doi: 10.1038/s41431-020-00725-5. Epub 2020 Sep 18.

Barriers and facilitators for cascade testing in genetic conditions: a systematic review

Swetha Srinivasan  1 , Nae Yeon Won  2 , W David Dotson  3 , Sarah T Wright  4 , Megan C Roberts  5
Affiliations

Barriers and facilitators for cascade testing in genetic conditions: a systematic review

Swetha Srinivasan et al. Eur J Hum Genet. 2020 Dec.

Abstract

Cascade testing is the process of offering genetic counseling and testing to at-risk relatives of an individual who has been diagnosed with a genetic condition. It is critical for increasing the identification rates of individuals with these conditions and the uptake of appropriate preventive health services. The process of cascade testing is highly varied in clinical practice, and a comprehensive understanding of factors that hinder or enhance its implementation is necessary to improve this process. We conducted a systematic review to identify barriers and facilitators for cascade testing and searched PubMed, CINAHL via EBSCO, Web of Science, EMBASE, and the Cochrane Library for articles published from the databases' inception to November 2018. Thirty articles met inclusion criteria. Barriers and facilitators identified from these studies at the individual-level were organized into the following categories: (1) demographics, (2) knowledge, (3) attitudes, beliefs, and emotional responses of the individual, and (4) perceptions of relatives, relatives' responses, and attitudes toward relatives. At the interpersonal-level, barriers and facilitators were categorized as (1) family communication-, support- and dynamics-, and (2) provider-factors. Finally, barriers at the environmental-level relating to accessibility of genetic services were also identified. Our findings suggest that several individual, interpersonal and environmental factors may play a role in cascade testing. Future studies to further investigate these barriers and facilitators are needed to inform future interventions for improving the implementation of cascade testing for genetic conditions in clinical practice.

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Conflict of interest statement

The authors declare that they have no conflict of interest.

Figures

Fig. 1
Fig. 1. PRISMA flow diagram.
Number of records identified, included and excluded in the systematic review, and reasons for exclusion.
See this image and copyright information in PMC

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