Baseline information to be obtained before commencing MTX
| *If the child proves to be negative to any of the above, ideally vaccination should be offered prior to commencing MTX. |
| Height, weight, and body surface area |
| Full blood count and differential white cell count |
| ESR +/− C reactive protein |
| Transaminases |
| Renal function tests |
| Urinalysis |
| Varicella titre, even if there is a history of chickenpox* |
| MMR titres, if none or primary dose only has been given* |