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3. Statistical Quality Control Testing for Quantitative Measurements: Principles and Definitions, (C24-A2, Approved Guideline). National Committee on Clinical Laboratory Standards (NCCLS), Wayne, PA, 1999.
4. Quality Management for Unit-Use Testing, (EP18-P, Proposed Guideline). National Committee on Clinical Laboratory Standards (NCCLS), Wayne, PA, 1999.
5. Medicare, Medicaid and CLIA programs: regulations implementing the Clinical Laboratory Improvement Amendments of 1988 (CLIA). Final rule;Fed. Regist.,1992