Abstract Background. Sinus-pulmonary manifestations are a major concern in CF patients. Pulmonary function shows a strong relationship with nutritional status. In Colombia, malnutrition is a public health issue; however there are no reports that fully analyze nutritional status and lung function in CF children. Materials and Methods. A cross-sectional study was developed with 32 patients registered in the CF Attention Program. Measurements were performed following the NIOSH Spirometry Training Guide. Body Mass Index (Z-Score) was calculated according to Onis.et.al. Correlation was determined by a regression model. Results. 14 children were able to perform the test with criteria for the study, mean for age 12.4 ± 3.4 years. % Forced Expiratory Volume1 and % Forced Vital Capacity means were 66.7 ± 28.5 and 69.5 ± 2.0, respectively. Body Mass Index (Z-score) mean was -1.17. BMI-regression for % Forced Expiratory Volume1, r2=0.31(
