A single use, spring-driven lancet assembly having a housing, a removable cap, a lancet, a lancet trigger member and a spring. The lancet trigger comprises a nose that extends from the front of the housing. When the lancet assembly is pressed against the skin or vice versa, the trigger is pushed toward the rear of the housing. A pair of flexible trigger arm members in contact with cocking lugs on the lancet body push the lancet to the rear and compress the spring. As the trigger and lancet move to the rear within the housing, the flexible arm members of the trigger are spread apart and the released lancet is propelled forward. The spring recoils into a neutral position and draws the lancet and its needle back into the housing. The lancet assembly cannot be re-cocked and the lancet needle cannot be intentionally or accidentally extended from the housing.
