Diagnosis of Kawasaki disease

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There is no one test to confirm the disease. A doctor makes the diagnosis from the symptoms and blood tests, which show high levels of white blood cells, raised markers of inflammation in the blood and high platelet counts. Tests may also be done to rule out other conditions that cause similar symptoms such as measles or scarlet fever.

An aneurysm (ballooning of the blood vessels) can be detected by a heart scan (an echocardiogram). If an aneurysm does occur, it starts to develop a week or more after the fever and other acute symptoms begin.