Glucose management indicator: Do we need device-specific equations?
Authors' conclusion
Device-specific GMI equations could reduce the risk of clinically significant under- and overestimation of HbA1c, improving clinical decision-making.
Study context
- Population
- Adults with T1D using Guardian Sensor 3 or 4 continuous glucose monitoring (CGM) devices194 measurement points
- Participants
- 120 adults
- Exposure
- Device-specific glucose management indicator (GMI) vs original GMI
- G3n = 90
- G4n = 30
- Outcome
- Performance of original GMI vs HbA1c by sensor
Methodological detailssingle-centre
- Single-centre
Main finding
As reported in the abstract
GMI significantly underestimated glycaemia in high HbA1c ranges, reaching the clinically significant 0.5% [4.4 mmol/mol] difference at HbA1c 7.6% [60 mmol/mol] for G3
7.6 %
60 mmol/mol
Same underestimation reaching 0.5% difference at HbA1c 8.3% [67 mmol/mol] for G4
8.3 %
67 mmol/mol
Observational data: associations, not effects.
Further findings
Glycaemic gap (HbA1c-GMI) vs HbA1c
- Strong relationship between all 3 gaps and HbA1c; slope steeper for Bergenstal-gap vs sensor-specific G3 and G4 gaps
- G3-gap approximately half the Bergenstal-gap for HbA1c >7% [53 mmol/mol]
- G4-gap approximately half the Bergenstal-gap across the whole HbA1c range
Original publication
Glucose management indicator: Do we need device-specific equations? Diabetes Metab. Published 6 May 2025. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →