Accu-Chek Safe-T-Pro Uno Lancets 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 while conducting tests for skin allergies.