Why is next-generation sequencing used in BRCA genetic testing?

BRCA1 and BRCA2 are genes involved in repairing damaged DNA. A laboratory can use next-generation sequencing to read selected genetic material and identify changes that may affect gene function. The test may look across coding regions and, depending on the laboratory method, may be paired with another analysis for larger missing or repeated sections.

A result needs interpretation in context. It may identify a harmful change, find no clearly harmful change, or report a variant whose meaning is uncertain. A genetic counsellor or qualified clinician can explain what the result means for you and whether relatives may need tailored advice. A test result does not by itself diagnose cancer.

Ask what sample is needed, whether the test examines inherited changes, how results will be reported, and who will explain them. Share relevant personal and family cancer history. If a familial BRCA change is already known, provide that information because it may guide the laboratory request. Discuss possible emotional, family, and privacy questions before giving a sample.

Genetic testing itself is not an emergency. Contact your clinician promptly if a result leaves you unsure about cancer screening, treatment decisions, or the meaning of a finding in your family. Seek urgent medical care for symptoms such as severe pain, heavy bleeding, sudden weakness, or breathing difficulty; genetic results do not replace assessment of an acute symptom.

Ask whether the test covers BRCA1, BRCA2, and larger gene changes, how uncertain variants are handled, what a positive or negative result could mean for relatives, and when a genetics professional will review the report.