Blood and Urine Tests
Haematological and serological tests contribute to making the diagnosis and marking progress of the disease and urinalysis is a useful initial screen to evaluate renal involvement (Table 1).
| Anaemia | 70-90% |
| Leukocytosis | 20-30% |
| Microscopic haematuria | 30-50% |
| Raised ESR | >90% |
| Rheumatoid factor | 50% |
| Immune complexes | 65-100% |
| Decreased serum complement | 5-40% |