REFERENCES
- Ric6s C, Juvany R, Alvarez V, Jimeenez CV, Perich C, Minchinela J, et al. Commutability between stabilized materials and fresh human serum to improve laboratory performance. Clin Chim Acta 1997; 263: 225–38.
- Glick MR, Ryder KW, Jackson SA. Graphic comparison of interference in clinical chemistry instrumentation. Clin Chem 1986; 32: 470–5.
- Libeer J-C, Baadenhuijsen H, Fraser CG, Hyltoft Petersen P, Ric6s C, Stockl D, Thienpont L. Characterization and classification of external assessment schemes (EQA) according to objec-tives such as evaluation of method and partici-pant bias and standard deviation. Eur J Clin Chem Clin Biochem 1996; 34: 665–78.
- Stamm D. A new concept for quality control of clinical laboratory investigations in the light of clinical requirements and based on reference method values. J Clin Chem Clin Biochem 1982; 20: 817–24.
- Tietz NW. Accuracy in clinical chemistry—does anybody care? Clin Chem 1994; 40: 859–61.
- Sandberg S, Gade Christensen N, Jevnaker M, Thue G, Klovning A. External quality assurance of haemoglobin and glucose in primary health care. Tidsskr Nor Lcegeforen 1996; 116: 25–9.
- Hörder, ed. Assessing quality requirements in clinical chemistry. Scand J Clin Lab Invest 1980; 40 Suppl 155: 1–144.
- de Verdier C-H, Groth T, Hyltoft Petersen P. editors. Medical need for quality specifications in clinical laboratories. Upsala J Med Sci 1993; 98: 187 —91.
- Hyltoft Petersen P, de Verdier C-H, Groth T, Fraser CG, Blaabjerg 0, Hörder M. The influence of analytical bias on diagnostic mis-classifications. Clin Chem Acta 1997; 260: 189–206.
- Fraser CG, Hyltoft Petersen P, Ric6s C, Haeckel R. Proposed quality specifications for the impre-cision and inaccuracy of analytical systems for clinical chemistry. Eur J Clin Chem Clin Biochem 1992; 30: 311–7.
- Stockl D, Baadenhuijsen H, Fraser CG, Libeer J-C, Hyltoft Petersen P, Ric6s C. Desirable rou-tine analytical goals for quantities assayed in serum. Discussion paper from the members of the external assessment (EQA) working group A on analytical goals in laboratory medicine. Eur J Clin Chem Clin Biochem 1995; 33: 157–69.
- Hyltoft Petersen, Blaabjerg, Irjala, editors. Assessing quality in measurements of plasma proteins. Upsala J Med Sci 1994; 99: 195–389.
- Hirst AD. External quality assurance. Ann Clin Biochem 1998; 35: 12–8.
- Linko S, Himberg J-J, Thienpont L, Stockl D, de Leenheer A. Assessment of the state-of-the-art trueness and precision of serum total-calcium and glucose measurements in Finnish laboratories—the QSL—Finland Study. Scand J Clin Lab Invest 1998; 58: 229–40.