| Acid, nitrous and nitrosonaphthol, 5-hydroxyindole acetic acid/serotonin7 groups | 143 | 7 |
| Colorimetric method, gamma-glutamyl transpeptidase / Kinetic method, gamma-glutamyl transpeptidase | 13 | — |
| Electrophoretic separation, alkaline phosphatase isoenzymes2 groups | 52 | 2 |
| Enzymatic esterase--oxidase, cholesterol2 groups | 44 | 2 |
| P-toluenesulphonyl-l-arginine methyl ester (u.v.), trypsin2 groups | 26 | 2 |