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How is JIA diagnosed?

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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.
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