Reliability of measurements of serum alanine transaminase activity and the impact on the cut-off value for the selection of blood donors.

1. Guidelines for thromboplastins and plasmas used to control anticoagulant therapy. World Health Organization Committee on Biological Standardization. WHO Technical Report Series 1999; 889:64-93. 2. van den Besselaar AM, Breddin K, Lutze G, Parker-Williams J, Taborski U, Vogel G, et al. Multicenter evaluation of a new capillary blood prothrombin time monitoring system. Blood Coagul Fibrinolysis 1995; 6:726-32. 3. Taborski U, Müller-Berghaus G. State-of-the-art patient self-management for control of oral anticoagulation. Semin Thromb Hemost 1999; 25:43-7. 4. Bland JM, Altman DG. Statistical methods for assessing agreement between two methods of clinical measurement. Lancet 1986; 1:307-10. 5. Passing H, Bablok W. A new biometrical procedure for testing the equality of measurements from different analytical methods. Application of linear regression procedures for method comparison studies in clinical chemistry, Part I. J Clin Chem Clin Biochem 1983; 21:709-20. 6. Cosmi B, Palareti G, Carpanedo M, Pengo V, Biasiolo A, Rampazzo P, et al. Assessment of patient capability to selfadjust oral anticoagulant dose: a multicenter study on home use of portable prothrombin time monitor (COAGUCHECK). Haematologica 2000; 85:826-31.