Original Article

Vitamin D Deficiency in Pediatric Patients with Cystic Fibrosis: Associated Risk Factors in the Northern United States

Objectives: Cystic fibrosis (CF) is associated with vitamin D deficiency, which can lead to adverse effects including recurrent pulmonary infections and osteoporosis. We longitudinally investigated calcifediol or 25-hydroxyvitamin D (25(OH)D) levels for our pediatric patients with CF based on the time of year as well as vitamin D supplementation dosing…