1. CMS- 2226-F: 42 CFR 493 Medicare, Medicaid, and Clinical Laboratory Improvement Amendments (CLIA) Programs; laboratory requirements relating to quality systems and certain personnel qualifications; section 493.1256 (d) (3), page 1038 Oct. 1 2004 edition. Code of Federal Regulations (CFR).
2. Statistical Quality Control for Quantitative Measurement Procedures. Approved guideline;CLSI/NCCLS,1991
3. Assessing the impact of the frequency of quality control testing on the quality of reported patient results;Parvin;Clin Chem,2008
4. CMS publication 7 State Operations Manual, Appendix C, Survey procedures and interpretive comments for laboratories and laboratory services, subpart K tag D5445, section 493.1256. Available at: http://www.cms.gov/Regulations-and-Guidance/Legislation/CLIA/Interpretive_Guidelines_for_Laboratories.html. Accessed October 12, 2012.
5. Laboratory Quality Control Based on Risk Management; approved guideline;CLSI,2011