a type of intracutaneous tuberculin test; needle points of a multiple-puncture apparatus are dipped into 1 to 2 drops of tuberculin PPD, then placed on the forearm and made to penetrate the skin to a depth of 1 mm, depositing tuberculin in the outer layer of the skin. In three to seven days, a positive reaction is palpable, coalescing induration (edema) extending more than 5 mm around the puncture wounds.