Other Tests

• Microbial cultures (sputum, throat, bronchoalveolar lavage, or sinus): isolation of P. aeruginosa, S. aureus, 5. maltophilia, and other CF-related organisms

• PFTs: decreased FEV1, decreased forced vital capacity (FVC), and increased residual volume. Values are typically lower during acute pulmonary exacerbations

• Chest x-ray or chest CT scan: infiltrates, atelectasis, bronchiectasis, and mucus plugging

• Abdominal x-ray or CT scan: if present, intestinal obstruction may be manifested as meconium ileus, DIOS, or intussusception. Rectal prolapse may be noted on physical exam

• Maldigestion: elevated fecal fat content, reduced fecal pancreatic elastase-1 (less than or equal to 200 mcg/g of feces)

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