The test is ‘feasible at scale’ on the NHS, say researchers Sign up for our free Health Check email to receive exclusive analysis on the week in health Get our free Health Check email Get our free Health Check email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice An annual blood test designed to detect multiple cancers before symptoms appear is "feasible at scale" on the NHS , experts have said. The Galleri test works by