Common blood tests for diagnosis and follow-up include complete blood count, erythrocyte sedimentation rate, C-reactive protein (CRP) to assess inflammation; rheumatoid factor and antinuclear antibodies to screen for rheumatic diseases; HLA-B27 to judge genetic-related types. For example, elevated CRP suggests active disease; HLA-B27 positivity suggests some types of immune-related uveitis are more likely.