Due to changes in availability of different sample tube types, your kit may contain sample tubes that are a different brand or hold a larger volume than the tubes in the instructional materials. If sizing of tubes differs, please ensure consistent filling by measuring the volume of blood placed in each tube using the syringe measurements. The instructions will indicate the volume of blood that should go into each tube, and tubes can be identified by the last three letters/numbers of the barcode on the label (e.g. passively fill the D07 Green Top lithium heparin Vacutainer tube with 2 mL of blood).