For more information, go to

How is JIA diagnosed?

Back to Juvenile idiopathic arthritis (JIA)

To make a diagnosis, a paediatric (young person's) rheumatologist will examine you and ask you questions. This will probably be done in a hospital.

There isn't a specific test for JIA, but your doctor will take blood tests and x-rays. They may also do other tests, including:

  • ultrasound or MRI scans to try to see if there's arthritis and to rule out other conditions
  • removing fluid from a joint (aspiration) to rule out joint infection
  • bone marrow examination to rule out some rare conditions, especially if they think you have systemic-onset JIA.

You'll be diagnosed with JIA if:

  • you've had arthritis for six weeks or more
  • your symptoms started before your 16th birthday
  • your doctor has ruled out other conditions that can cause arthritis.
Previous Next
Back to Juvenile idiopathic arthritis (JIA)
For more information, go to or call 0300 790 0400 to order the complete printed booklet.
Arthritis Research UK fund research into the cause, treatment and cure of arthritis. You can support Arthritis Research UK by volunteering, donating or visiting our shops.