| Redaktionellt | 5 |
| Medlemmar i ECCLS:s ad-hoc grupp | 8 |
| Preface | 9 |
| Related publications from standard setting organizations | 11 |
| General introduction | 13 |
| Determination of the catalytic activity concentration in serum of Creatine Kinase (EC2.7.3.2,CK) | 19 |
| Determination of the catalytic activity concentration in serum of L -Aspartate Aminotransferase (EC 2.6 . 1. 1, ASAT) | 41 |
| Determination of the catalytic activity concentration in serum of L-Aianine Aminotransferase (EC 2.6.1 .2, ALAT) | 57 |
| Determination of the catalytic activity concentration in serum of Gamma-Giutamyltransferase (EC 2.3.2.2, GT) | 77 |