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4NCCLS. EPg-A2 Method Comparison and Bias Estimation Using Patient Samples: Appr Guideline-Second Edition [ M]. Pennsylvania: NCCLS, 2002 : 1-56.
5NCCLS. EPS-A2 Evaluation of Precision Performance ofQuantitative Measurement Methods:Appr Guideline Sec- ond Edition[ M]. Pennsylvania: NCCLS, 2004 :1-39.
6NCCLS. C28-A2 How to Define and Determine Reference Intervals in the Clinical I.aboratory; Approved Guideline Second Edition[M]. Pennsylvania: NCCLS, 2000 : 1-40.
