Draw Fagan diagram (Fig 11) after test probability estimation, with Fagan analysis of NT-ProBNP value in evaluating Kawasaki disease, that is, the test probability of the study gold standard was set to 80%, calculation of NT-ProBNP in Kawasaki disease, if the probability of diagnosis of coronary artery lesions is 94%, the exclusion of coronary disease was 44%, indicating that the probability was large, but the exclusion probability was small. The gene discussed is NPPB; the disease is Kawasaki disease.