Differential diagnosis considered and the investigations requested
| Diagnosis | Investigation |
|---|---|
| CPK, creatine phosphokinase; CRP, C reactive protein; EBV, Epstein-Barr virus; ESR, erythrocyte sedimentation rate; FBC, full blood count; JIA, juvenile idiopathic arthritis; LFT, liver function test; U&E, urea and electrolytes. | |
| Leukaemia | FBC and film |
| Dermatomyositis | CPK |
| JIA | ESR, CRP, FBC |
| Glandular fever | EBV serology |
| Hepatitis | LFT |
| Renal impairment | U&E and creatinine |
| Endocrine disease, e.g. Addison’s or hypothyroidism | U&E and thyroid function |
| Diabetes | Random glucose |