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<b>Background</b>: Asthma is very common in children and its diagnosis is based on clinical manifestations, which can be misdiagnosed as other respiratory diseases with similar signs and symptoms. <br/><b>Objective</b>: To analyze the expression of ST2L and CD203c in the diagnosis of pediatric asthma. <br/><b>Methods</b>: Basophils were purified from whole blood samples of patients and healthy controls using Ficol-Paque gradient and Basophil Isolation Kit. RNA extraction was done by RNX-Plus solution and after synthesis of cDNA, the gene expression was analyzed by means of real time PCR. <br/><b>Results</b>: Patients expressed significantly higher levels of CD203c than healthy controls (p=0.01). Although there was an increase in the transcription level of ST2L gene in patients, the results were not statistically significant compared to those obtained from the healthy controls (p>0.05). A Specificity of 60% and a sensitivity of 73% were foundusing ROC curve for CD203c expression. Patients with positive family history of asthma exhibited more CD203c and ST2L expression (p<0.05). <br/><b>Conclusion</b>: It is proposed that determining CD203c expression by real time PCR may be an effective technique for diagnosis of pediatric asthma.