measles – a highly infectious viral illness that causes a fever and distinctive red-brown spots
glandular fever – a viral infection that can cause a fever and swollen lymph glands
Stevens-Johnson syndrome – a very severe allergic reaction to medication
viral meningitis – an infection of the protective membranes that surround the brain and spinal cord (meninges)
lupus – an autoimmune condition that can cause a range of symptoms, including fatigue, joint pain and a rash
Several tests can also be carried out to help support a diagnosis of Kawasaki disease.
a urine sample – to see whether it contains white blood cells
blood tests – such as a white blood cell count or platelet count
alumbar puncture – a sample of cerebrospinal fluid is taken by inserting a needle between the vertebrae of the lower spine
Individually, these tests may not be conclusive, but when combined with some of the key symptoms listed above, they can help confirm a diagnosis.
Complications of Kawasaki disease usually affect the heart. This means your child may need some tests to check their heart is functioning normally.
These must include:
an electrocardiogram (ECG) – which measures the heart's electrical activity using flat metal discs (electrodes) attached to the arms, legs and chest; an ECG can identify damage to the heart or problems with the heart's rhythm
an echocardiogram – this involves high-frequency sound waves used to produce images of the heart, which can confirm whether there are any problems with the heart's structure or function
During the acute phase of Kawasaki disease (weeks 1 to 2), several heart abnormalities may be identified.
These could include:
a rapid heart rate (tachycardia)
a collection of fluid in the heart (pericardial effusion)