الفهرس 
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Abstract
Pulmonary function test is a part of many investigations used in childhood lung diseases. They measure the ability of the respiratory system to perform gas exchange by assessing its ventilation, diffusion and mechanical properties. Pulmonary function tests are important tools in the diagnosis management of respiratory tract illness in childhood. They provide an objective assessment of the degree of the degree of severity of the disease process and can differentiate between different patterns of pulmonary disease, and evaluate the degree of efficacy of new therapeutic interventions. All pulmonary function measurement vary in healthy subjects, some tests vary much more than others. They vary in a predictable way in relation to one or more physical factors. The physical factors that most influence pulmonary functions are as follow: 1) age, 2) sex, 3) standing height, 4) race and 5) weight or body surface area. In spite of many available records of normal lung function tests done in children in different countries, it is difficult to apply these records on Egyptian children because of epidemiological variants as, genetic elements, nutritional states, living condition. So we aimed to find out the normal values of lung function in Dakahlia Governorate children. A 3000, normal healthy children aged from 8 to 15 years, (1648) males and (1352) females were included in our study. Select children were subjected to the following: 1) Detailed history taking 2) Comprehensive physical examination. 3) Anthropometric measurements especially height and weight. 4) Spirometric lung function tests as SVC, FVC, FEV1 and PERF. On correlating different variables to spirometric parameters we found that: ” There were a significant increase was found between SVC with increased height, this observation was not found in other researches. ” There were a significant increase in PFTs (SVC, FVC, FEV1 and PERF) with increased age, also, SVC showed a significant increase with age, this observation was not found in other researches. ” There was a significant difference between male and female in PFTs (SVC, FVC, FEV1 and PERF) more in male than female. ” There was a significant correlation between in PFTs (SVD, FVC, FEV1 and PERF) and BMI in both male and female. ” There was a separate prediction equation for each of spirometric pulmonary function tests (SVC, FVC, FEV1 and PERF) for each sex.