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A 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.A blood-sampling device, also known as a lancing device, is an instrument equipped with a lancet. It is also most commonly used by diabetics during blood glucose monitoring. The depth of skin penetration can be adjusted for various skin thicknesses. Long lancing devices are used for fetal scalp blood testing to get a measure of the acid-base status of the f15etus.