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Archivos de Pediatría del Uruguay

versión impresa ISSN 0004-0584versión On-line ISSN 1688-1249


MARTINEZ, Andrea et al. Meconium Ileus and false negative immunoreactive trypsine results in a cystic fibrosis carrier infant. Arch. Pediatr. Urug. [online]. 2024, vol.95, n.1, e304.  Epub 01-Jun-2024. ISSN 0004-0584.


cystic fibrosis (CF) is a genetic, multisystemic disease, characterized by dysfunction of the exocrine secretion glands secondary to the mutation of a transmembrane protein that acts as a chloride channel. Including its research by the National Neonatal Screening System (SNPN) caused a great impact on the morbidity and mortality of this disease, enabling early diagnosis and treatment. Meconium ileus (MI) is the earliest manifestation of the disease, occurring in 10% to 18% of patients.


to describe a form of early presentation of CF with normal neonatal screening results.

Clinical case:

18 months. Female, 33 weeks gestational age. Delay in the expulsion of meconium. On the third day of life, meconium ileus with intestinal obstruction, midgut volvulus and intestinal necrosis. Surgical resection is performed. Trypsin immunoreactive (TIR) normal at 7 and 23 days of age. Pancreatitis-associated protein (PAP) is not requested.

Chronic malnutrition, severe bronchiolitis at 3 months, viral pneumonia at 7 and 11 months. Admission with a diagnosis of acute community pneumonia with respiratory failure. Sweat test altered on two occasions. Insufficient pancreatic elastase. Staphylococcus aureus and Pseudomonas aeruginosa were isolated in nasal exudate and respiratory secretions. Genetic study: Delta F508 mutation. With the CF diagnosis, a multidisciplinary approach, treatment and referral to a specialized center began.


the existence of MI can provide false negatives in the IRR value, making PAP dosage necessary. The prognosis of these patients will depend on early diagnosis and timely therapeutic management at specialized centers.

Palabras clave : Meconium Ileus; Cystic Fibrosis; Trypsin.

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