What should you know about first next generation sequencing?

A laboratory reads selected genetic material from blood, saliva, or a tumour sample. Unlike a test aimed at one gene, sequencing can review a group of genes together. The result may show a change linked with an inherited condition, a tumour characteristic, or a finding whose meaning is not yet clear. A result does not by itself diagnose cancer or predict exactly what will happen.

The sample type and test panel depend on the reason for testing. Tumour profiling looks for changes in cancer cells, while inherited testing looks for changes present throughout the body. Genetic counselling may be useful when an inherited finding could affect relatives.

Ask which sample is needed, whether a stored pathology sample can be used, and what the test is intended to answer. Give the team your personal and family history, including cancers diagnosed in close relatives. Results can take time because the laboratory checks the findings and a clinician interprets them in context.

When the report arrives, ask which findings are actionable, whether another test is needed, and whether the result changes treatment or screening. Keep a copy of the report and clarify whether relatives should seek advice.

Contact your care team if you are unsure why sequencing was ordered, if a result is described as inherited or uncertain, or if you receive a result without an explanation of its next step. Seek urgent medical help for new severe symptoms; genetic test results themselves do not usually create an emergency.

What question is this test designed to answer? Which genes and sample type are included? Could the result affect my relatives? What happens if the result is negative, uncertain, or shows a change that may guide treatment?