Dario™ Glucose Control Solution contains a known amount of glucose that reacts with chemicals on the Dario™ test strip. When applying a drop of control solution to the test strip, following the same procedure that is used for whole blood, the glucose in the control solution reacts with chemicals in the test strip. The result displayed on the meter should fall within the expected range printed on the test strip cartridge label. Obtaining a single result within the expected range is sufficient to verify system performance.