How to Use This Report

The SDI and CVR are combined as X-Y coordinates located within one of three performance zones shown by increased levels of shading:

• No shading - Acceptable performance.
• Slight shading - Acceptable to marginal performance.

  May indicate the need to investigate test system bias and imprecision.

• Darkest shading - Marginal performance.

  May need to perform a corrective action.

• Outside of graph - Unacceptable performance.

  Requires corrective action.

The center of the graph (SDI and CVR both equal to zero) represents perfect agreement between your laboratory's values and your consensus group (Peer or Method) statistics. Your bias and imprecision increase as your values move further away from the center of the graph.

The report contains a signature line and a section to document corrective actions needed.