- Blood tests: Inflammatory markers ESR, CRP along with HLA B27  - Outcome measures: CHAQ, JADAS, BASDAI, ASDAS, and JADI - Joints: X ray, Ultrasound or MRI of affected joints - Associations: Fecal calprotectin and upper and lower GI endoscopy, Skin biopsy for psoriasis, cardiac assessment by pediatric cardiologist. Here, CRP is linked to psoriasis.