Level 1 and 2 (4 vials / 2 each) A two-level, on-board quality control test is performed within the test chamber as part of every blood test Roche Diagnostics has available optional liquid quality controls (REF 04625382160) for the CoaguChek XS Plus System. These controls are provided to assist with meeting regulatory compliance requirements, as applicable to your facility. Item requires refrigeration for product stability.