machine (coagulometer) is a portable medical device that measures how long your blood takes to clot, displayed as an International Normalized Ratio (INR). It is primarily used by patients on blood-thinning medications like Warfarin to safely monitor and manage their dosage from home.How It WorksPreparation: Insert a meter-specific test strip and the corresponding coding chip into the device.Sample Collection: Use a lancing device to prick the side of your fingertip.Testing: Apply a single drop of blood to the designated area on the test strip.Result: The machine reads the sample and provides an accurate INR reading in under a minute.Popular UK Models & CostsIn the UK, the Roche CoaguChek is the leading brand for home INR self-testing.