Table 1. Liver Enzyme Normal Values for Age According to the Literature a.
| Enzyme | Temp | 0-1 Year | 1-3 Years | 3-6 Years | 6-12 Years |
|---|---|---|---|---|---|
| AST, U/L | 25°C | 40 | 24 | 18 | 23 |
| 37°C | 82 | 48 | 36 | 47 | |
| ALT, U/L | 25°C | 29 | 18 | 16 | 21 |
| 37°C | 54 | 33 | 29 | 39 | |
| GGT, U/L | 25°C | 13 | |||
| 37°C | 34 |
a Before April 1st 2003 enzyme levels of aminotransferases and GGT were measured at 37°C and calculated to an activity at 25°C. This procedure was than changed to the international standard procedure. To compare data before and after that change and to overcome the problem of age depending normal values ratios of enzyme level and the upper limit of normal of the enzyme was build.