Test strips are used in conjunction with a blood glucose meter to monitor blood glucose levels. The FreeStyle Optium Neo, FreeStyle Libre, FreeStyle Optium, Optium, Optium Xceed, Boots, and Optium Easy Meters may use these test strips. They are made to measure the amount of glucose in fresh capillary whole blood taken from a fingertip, forearm, upper arm, or thumb base.