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Normalized OPSpecs Chart, N=6, 90% AQA

A Normalized OPSpecs charts displaying QC procedures with Ns of 6, 90% AQA.

OPSpecs Chart N=3 90% AQA

A Normalized OPSpecs chart for QC procedures for Ns of 3, with 90% AQA.

Order Form

An order form for Westgard products and courses.

Six Sigma Table

A table presenting both short-term and long-term Sigma rates for various %Yield and Cp values.

Medical Decision Levels

These tables of medical decision levels provide possible critical decision levels - where you can assess performance (CV, bias) and determine the Sigma-metrics and appropriate QC procedures.

These figures are quoted from Statland BE. Clinical Decision Levels for Laboratory Tests, Second Edition [Oradell NJ;Medical Economics Books, 1987.] with permission.