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[ Home ](https://mdster.com) 2. [ Blog ](https://mdster.com/blog) 3. [ Case Discussion ](https://mdster.com/blog?category=case-discussion) 4. Pediatric Cystic Fibrosis Case: Cough, Steatorrhea, Clubbing [ Case Discussion ](https://mdster.com/blog?category=case-discussion) Pediatric Cystic Fibrosis Case: Cough, Steatorrhea, Clubbing ============================================================== A board-focused case discussion on late-presenting cystic fibrosis, pulmonary exacerbation management, pancreatic insufficiency, and long-term surveillance. [ MDster Editorial Team ](https://mdster.com/about) · Jul 02, 2026 · 7 min read · 30 [ Reviewed by Dr. Ali Ragab, MBBCH, MSc, MCAI ](https://mdster.com/medical-reviewers/dr-ali-ragab) [Editorial Policy](https://mdster.com/editorial-policy) | [Corrections Policy](https://mdster.com/corrections) [ Board Review ](https://mdster.com/blog?tag=board-review) [ Pediatrics ](https://mdster.com/blog?tag=pediatrics) [ Gastroenterology ](https://mdster.com/blog?tag=gastroenterology) [ Pulmonology ](https://mdster.com/blog?tag=pulmonology) [ Cystic Fibrosis ](https://mdster.com/blog?tag=cystic-fibrosis) ![Pediatric Cystic Fibrosis Case: Cough, Steatorrhea, Clubbing](https://mdster.com/storage/blog/images/pediatric-cystic-fibrosis-case-cough-steatorrhea-clubbing.jpg) Share this article Share this post On this page 1. [ Reading the vignette correctly ](#reading-the-vignette-correctly) 2. [ Diagnostic confirmation and initial workup ](#diagnostic-confirmation-and-initial-workup) 3. [ Managing the pulmonary exacerbation ](#managing-the-pulmonary-exacerbation) 4. [ Pancreatic insufficiency and nutrition ](#pancreatic-insufficiency-and-nutrition) 5. [ Long-term surveillance and genetics ](#long-term-surveillance-and-genetics) 6. [ Clinical application ](#clinical-application) 7. [ Key Points for Board Exams ](#key-points-for-board-exams) 8. [ Conclusion ](#conclusion) 9. [ Frequently Asked Questions ](#blog-faqs) 10. [ References ](#references-heading) On this page 1. [ Reading the vignette correctly ](#reading-the-vignette-correctly) 2. [ Diagnostic confirmation and initial workup ](#diagnostic-confirmation-and-initial-workup) 3. [ Managing the pulmonary exacerbation ](#managing-the-pulmonary-exacerbation) 4. [ Pancreatic insufficiency and nutrition ](#pancreatic-insufficiency-and-nutrition) 5. [ Long-term surveillance and genetics ](#long-term-surveillance-and-genetics) 6. [ Clinical application ](#clinical-application) 7. [ Key Points for Board Exams ](#key-points-for-board-exams) 8. [ Conclusion ](#conclusion) 9. [ Frequently Asked Questions ](#blog-faqs) 10. [ References ](#references-heading) She is already telling you the diagnosis. A school-aged child with chronic productive cough, steatorrhea, weight faltering despite appetite, prior neonatal bowel obstruction consistent with meconium ileus, and clubbing has cystic fibrosis until proven otherwise. The real question is whether you recognize the multisystem pattern before another year of irreversible airway injury. Reading the vignette correctly ------------------------------ CF best explains the convergence of suppurative lung disease and fat malabsorption. CFTR dysfunction dehydrates airway secretions and obstructs pancreatic ducts, so chronic endobronchial infection and exocrine pancreatic insufficiency often travel together. Diagnosis, however, still requires objective evidence of CFTR dysfunction rather than phenotype alone. [\[1\]](#cite-1 "Reference [1]") A useful exam clue is the clubbing. In a child with a chronic wet cough, clubbing should push you toward suppurative lung disease, including CF, rather than more asthma escalation. [\[2\]](#cite-2 "Reference [2]") DifferentialWhy it is less convincing herePrimary ciliary dyskinesiaExplains chronic wet cough, but not pancreatic insufficiency or classic meconium ileus historyPrimary immunodeficiencyCan cause recurrent chest infection, but greasy bulky stools and neonatal bowel obstruction point elsewhereCeliac diseaseCan cause weight loss and steatorrhea, but not chronic suppurative lung disease with clubbing Diagnostic confirmation and initial workup ------------------------------------------ The gold-standard confirmatory test is quantitative pilocarpine iontophoresis sweat chloride testing at an experienced CF center. In a patient with suggestive features, a sweat chloride of 60 mmol/L or greater confirms CF; values below 30 mmol/L make CF unlikely, while 30 to 59 mmol/L on repeat testing should trigger extended CFTR analysis and, when needed, functional testing. [\[3\]](#cite-3 "Reference [3]") Do not stop at the sweat test. Send CFTR genotyping because variant-specific therapy may be indicated, obtain airway cultures at presentation and with each respiratory exacerbation, and assess pancreatic status if there is uncertainty clinically. In this vignette, the stool history and growth pattern already strongly support pancreatic insufficiency. [\[4\]](#cite-4 "Reference [4]") > **Clinical Pearl:** In an older child with presumed recurrent bronchitis or poorly controlled "asthma," the combination of clubbing, greasy stools, and failure to thrive should trigger sweat testing early. [\[3\]](#cite-3 "Reference [3]") Managing the pulmonary exacerbation ----------------------------------- This child needs admission because she is hypoxemic, malnourished, and has diffuse exam and radiographic abnormalities. During a pulmonary exacerbation, airway clearance should be increased rather than deferred, and chronic lung-health therapies should usually be continued. [\[5\]](#cite-5 "Reference [5]") Practically, that means scheduled chest physiotherapy using the child's established technique, whether oscillatory vest, PEP, or manual CPT. Dornase alfa and hypertonic saline remain standard mucoactive adjuncts in CF care; inpatient use is usually an extension or optimization of the home regimen rather than a completely new strategy. [\[6\]](#cite-6 "Reference [6]") Antibiotics should become culture-directed as soon as microbiology returns, but empiric inpatient therapy in advanced CF lung disease usually covers *Staphylococcus aureus* and *Pseudomonas aeruginosa*. For a sick child with suspected or confirmed *Pseudomonas*, many centers use two antipseudomonal agents from different classes; importantly, CFF guidance states there is insufficient evidence to conclude that a single agent is equivalent to multiple classes in this setting. If an aminoglycoside is used, once-daily dosing is preferred. [\[5\]](#cite-5 "Reference [5]") If she later improves enough for outpatient oral treatment, oral antipseudomonal therapy is essentially limited to fluoroquinolones, usually ciprofloxacin, because the other routine antipseudomonal agents used in CF are inhaled or intravenous. That is a classic board-style question. [\[7\]](#cite-7 "Reference [7]") Pancreatic insufficiency and nutrition -------------------------------------- Her growth failure is not a side issue; it is core disease biology. CFF nutrition guidance supports higher caloric intake than healthy peers, and pancreatic-insufficient patients should receive a high-calorie diet with unrestricted fat rather than a low-fat diet. Better nutritional status is associated with better pulmonary outcomes. [\[8\]](#cite-8 "Reference [8]") PERT should be given with every meal and snack. In older children, dosing is commonly 500 to 2,500 lipase units/kg/meal and 250 to 1,250 units/kg/snack, or it may be adjusted by grams of fat; capsules can be opened and sprinkled on a small amount of acidic food if swallowing is an issue. [\[9\]](#cite-9 "Reference [9]") The safety limit is high-yield. Reassess before exceeding 2,500 lipase units/kg/meal, and remember that doses above 6,000 units/kg/meal have been associated with fibrosing colonopathy. If steatorrhea persists, think about adherence, meal timing, intestinal hyperacidity, liver disease, or a second GI diagnosis instead of reflexively escalating enzymes. Monitor and replace fat-soluble vitamin deficiencies during nutritional rehabilitation. [\[9\]](#cite-9 "Reference [9]") Long-term surveillance and genetics ----------------------------------- Discharge planning should look past the current flare. Formal annual screening for glucose intolerance with a 2-hour OGTT begins at age 10 in standard CFF and ECFS care, and HbA1c is not recommended as the screening test because it can miss CFRD. [\[10\]](#cite-10 "Reference [10]") ABPA, hepatobiliary disease, and DIOS require deliberate surveillance. CFF ABPA guidance recommends annual total IgE screening in patients older than 6 years; newer hepatobiliary guidance recommends annual liver labs from diagnosis and liver-spleen ultrasound at least every 2 years from childhood through late adolescence; ECFS standards advise routine assessment for constipation and DIOS symptoms. [\[11\]](#cite-11 "Reference [11]") Genetics matters at two levels: treatment eligibility and family counseling. CF is autosomal recessive, so if both parents are carriers, each pregnancy carries a 25% risk of CF, a 50% risk of an unaffected carrier, and a 25% chance of an unaffected non-carrier; genetic counseling should be offered. [\[1\]](#cite-1 "Reference [1]") Clinical application -------------------- The common mistake is compartmentalizing the case into separate pulmonary and GI problems. The board answer is sweat chloride, but the clinical answer is integrated CF-center care: confirm CFTR dysfunction, sample the airways, treat the exacerbation aggressively, start PERT correctly, and rebuild nutrition immediately. [\[12\]](#cite-12 "Reference [12]") Key Points for Board Exams -------------------------- - Chronic productive cough, steatorrhea, poor weight gain, and prior meconium ileus should make CF the leading diagnosis. - Quantitative pilocarpine iontophoresis sweat chloride testing is the diagnostic gold standard; in a symptomatic child, 60 mmol/L or greater confirms CF. [\[3\]](#cite-3 "Reference [3]") - During pulmonary exacerbation, increase airway clearance and continue chronic maintenance therapies while cultures guide antibiotics. [\[5\]](#cite-5 "Reference [5]") - For suspected or confirmed *Pseudomonas* exacerbation, many teams use two antipseudomonal classes; once-daily aminoglycoside dosing is preferred when used. [\[5\]](#cite-5 "Reference [5]") - PERT goes with every meal and snack; do not exceed 2,500 lipase units/kg/meal without reassessment because high doses are linked to fibrosing colonopathy. [\[9\]](#cite-9 "Reference [9]") - Screen annually for CFRD with a 2-hour OGTT from age 10, and monitor long term for ABPA, hepatobiliary disease, and DIOS. [\[10\]](#cite-10 "Reference [10]") Conclusion ---------- This is a classic multisystem pediatric CF presentation. When the lungs, pancreas, growth curve, and neonatal history all line up, move quickly from suspicion to sweat testing and coordinated CF care before late presentation becomes fixed bronchiectatic disease. [\[1\]](#cite-1 "Reference [1]") Frequently Asked Questions ---------------------------- ### Is sweat chloride still the preferred confirmatory test when CFTR sequencing is available? Yes. Quantitative pilocarpine iontophoresis sweat chloride testing remains the diagnostic gold standard; CFTR genotyping complements diagnosis and helps determine eligibility for variant-specific therapy. [\[3\]](#cite-3 "Reference [3]") ### When should pancreatic insufficiency be assumed in a child with suspected CF? Steatorrhea, poor weight gain despite adequate intake, bloating, and foul bulky stools strongly suggest pancreatic insufficiency. Once established, PERT should be given with every meal and snack. [\[9\]](#cite-9 "Reference [9]") ### Why is HbA1c not an adequate screening test for CF-related diabetes? CFF guidance recommends annual 2-hour OGTT screening from age 10 because HbA1c may be low or falsely reassuring in CF and can miss CFRD. [\[10\]](#cite-10 "Reference [10]") ### What is the board-relevant oral option for outpatient Pseudomonas treatment? Oral antipseudomonal therapy in CF is essentially limited to fluoroquinolones, most commonly ciprofloxacin, because the other standard antipseudomonal agents are generally IV or inhaled. [\[7\]](#cite-7 "Reference [7]") ### Why should enzyme doses not be increased indefinitely when stools remain greasy? Because persistent symptoms may reflect adherence problems, incorrect timing, hyperacidity, liver disease, or another GI process. Enzyme doses above 2,500 lipase units/kg/meal warrant investigation, and very high doses have been associated with fibrosing colonopathy. [\[9\]](#cite-9 "Reference [9]") References (18) ------------------- 1. 1. [ www.cff.org/medical-professionals/cf-diagnosis-clinical-care-guidelines ](https://www.cff.org/medical-professionals/cf-diagnosis-clinical-care-guidelines) [↩](#cite-ref-1-1 "Back to text") 2. 2. [ www.nhlbi.nih.gov/health/cystic-fibrosis/symptoms ](https://www.nhlbi.nih.gov/health/cystic-fibrosis/symptoms) [↩](#cite-ref-2-1 "Back to text") 3. 3. [ www.cff.org/medical-professionals/sweat-test-clinical-care-guidelines ](https://www.cff.org/medical-professionals/sweat-test-clinical-care-guidelines) [↩](#cite-ref-3-1 "Back to text") 4. 4. [ www.ecfs.eu/sites/default/files/standards-of-care-files/All%20statements.pdf ](https://www.ecfs.eu/sites/default/files/standards-of-care-files/All%20statements.pdf) [↩](#cite-ref-4-1 "Back to text") 5. 5. [ www.cff.org/medical-professionals/pulmonary-exacerbations-clinical-care-guidelines ](https://www.cff.org/medical-professionals/pulmonary-exacerbations-clinical-care-guidelines) [↩](#cite-ref-5-1 "Back to text") 6. 6. [ www.cff.org/medical-professionals/chronic-medications-maintain-lung-health-clinical-care-guidelines ](https://www.cff.org/medical-professionals/chronic-medications-maintain-lung-health-clinical-care-guidelines) [↩](#cite-ref-6-1 "Back to text") 7. 7. [ www.cff.org/managing-cf/antibiotics ](https://www.cff.org/managing-cf/antibiotics) [↩](#cite-ref-7-1 "Back to text") 8. 8. [ www.cff.org/medical-professionals/nutrition-children-and-adults-clinical-care-guidelines ](https://www.cff.org/medical-professionals/nutrition-children-and-adults-clinical-care-guidelines) [↩](#cite-ref-8-1 "Back to text") 9. 9. [ www.cff.org/medical-professionals/pancreatic-enzymes-clinical-care-guidelines ](https://www.cff.org/medical-professionals/pancreatic-enzymes-clinical-care-guidelines) [↩](#cite-ref-9-1 "Back to text") 10. 10. [ www.cff.org/medical-professionals/cystic-fibrosis-related-diabetes-clinical-care-guidelines ](https://www.cff.org/medical-professionals/cystic-fibrosis-related-diabetes-clinical-care-guidelines) [↩](#cite-ref-10-1 "Back to text") 11. 11. [ www.cff.org/medical-professionals/allergic-bronchopulmonary-aspergillosis-clinical-care-guidelines ](https://www.cff.org/medical-professionals/allergic-bronchopulmonary-aspergillosis-clinical-care-guidelines) [↩](#cite-ref-11-1 "Back to text") 12. 12. [ www.cff.org/medical-professionals/clinical-care-guidelines ](https://www.cff.org/medical-professionals/clinical-care-guidelines) [↩](#cite-ref-12-1 "Back to text") 13. 13. Farrell PM, White TB, Ren CL, et al. Diagnosis of Cystic Fibrosis: Consensus Guidelines from the Cystic Fibrosis Foundation. J Pediatr. 2017. 14. 14. Cystic Fibrosis Foundation. Sweat Test Clinical Care Guidelines. 15. 15. Flume PA, Mogayzel PJ Jr, Robinson KA, et al. Cystic Fibrosis Pulmonary Guidelines: Treatment of Pulmonary Exacerbations. Am J Respir Crit Care Med. 2009. 16. 16. Borowitz DS, Grant RJ, Durie PR, et al. Use of Pancreatic Enzyme Supplements for Patients With Cystic Fibrosis in the Context of Fibrosing Colonopathy. J Pediatr. 1995. 17. 17. Moran A, Brunzell C, Cohen RC, et al. Clinical Care Guidelines for Cystic Fibrosis-Related Diabetes. Diabetes Care. 2010. 18. 18. Sellers ZM, Assis DN, Paranjape SM, et al. Cystic Fibrosis Screening, Evaluation, and Management of Hepatobiliary Disease Consensus Recommendations. Hepatology. 2024. 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