Abstract
Objectives: In 2022, the West Midlands Adult Cystic Fibrosis Centre began using Freestyle Libre flash glucose monitoring system (FGM) as a first line method for cystic fibrosis related diabetes (CFRD) screening, as an alternative to oral glucose tolerance testing (OGTT). There are no published criteria for the diagnosis of CFRD using FGM. Using the WHO criteria, the Brompton’s paediatric clinical guideline and clinical judgement we devised diagnostic criteria to standardise the diagnosis of CFRD using FGM. Diagnostic criteria - CFRD >2 readings >11.1, impaired glucose tolerance (IGT) >2 readings 7.8–11 or <3.5; over a 2 week period. The aim of this study was to compare the number of patients diagnosed with CFRD and IGT using our new FGM diagnostic criteria compared to using our previous non standardised practice of using clinical judgement. We aimed to assess if there was any difference in the number of patients being diagnosed with CFRD or IGT using our new criteria.
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