There is no single test your doctor can do to confirm that you have Still’s disease. Instead, they'll gather information using:

• Your symptoms;
• Physical exams;
• Blood tests to see if you have other issues like infection or cancer;
• Ultrasound of your abdomen;
• CT scan;
• X-ray.

Imaging tests like ultrasounds, X-rays, and CT scans can help your doctor see if the disease damaged any of your organs.