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A blood lancet, or simply lancet, is a small medical implement used for capillary blood sampling. A blood lancet is similar to a small scalpel but with a double-edged blade or needle. Lancets are used to make punctures, such as a fingerstick, to obtain small blood specimens. Blood lancets are generally disposable. Lancets are also used to prick the skin in skin testing 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 penetratioNCINALcknesses. Long lancing devices are used for fetal scalp blood testing to get a measure of the acid base status of the fetus.