Final answer:
The child's symptoms suggest systemic onset juvenile rheumatoid arthritis (Still's disease), characterized by joint symptoms and systemic features such as fever and abdominal pain. Diagnosis includes blood tests and imaging.
Step-by-step explanation:
The findings of joint swelling, warmth, tenderness, fever, and abdominal pain in a child who has been diagnosed with juvenile rheumatoid arthritis (JRA) are indicative of systemic onset JRA, also known as Still's disease. This form of JRA is characterized by the involvement of one or more joints that become swollen, warm, and painful, accompanied by systemic symptoms such as a high fever and inflammation in other body parts, like the abdominal region. The diagnosis and management of rheumatoid arthritis involve assessing the symptoms, performing blood tests for rheumatoid factor (RF), anti-cyclic citrullinated peptide (anti-CCP) antibodies, elevated C-reactive protein (CRP), and the erythrocyte sedimentation rate (ESR), along with imaging tests such as X-rays, ultrasound, or MRI to identify joint damage.