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Collecting a Biotracking sample requires the use of a double pointed blood collecting needle, a reusable plastic holder for the needle and a Vacutainer® tube for collecting the sample. We recommend using an 18 gauge x 1" blood collecting needle and a 3ml plastic Vacutainer® tube. These are each sold in boxes of 100 pieces. In addition, be sure to buy a few of the plastic needle holders. Get detailed instructions here.