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DGARYS blood lancet, or simply lancet, is a small medical device used for sampling capillary blood. A blood lancet is similar to a small scalpel but with a double-edged blade or needle. The lancet is used to make punctures, such as a fingerstick, to obtain small blood samples. Blood lancets are usually disposable. The lancet is also used to puncture the skin in a skin test for allergies.