Is the NHS about to have a revolution in diagnosis?

Our human bodies have about 20,000 genes (groups of DNA instructions that control our bodies.) Sometimes, there are little errors in the code, either inherited from parents or minor mutations in cells, which can lead to illnesses such as cancer. A process called whole genome screening (WGS) is a way doctors can identify specific errors which, in about two-thirds of cases, can improve diagnosis and care. Over 31,000 NHS patients have already had their entire genetic code sequenced but Dame Sally wants WGS to become as standard as blood tests and biopsies, that is, if the country can afford it.

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