Agreement of Over-the-Counter Continuous Glucose Monitors With Capillary-Meter Glucose in Young Adults Without Diabetes
Authors' conclusion
Over-the-counter continuous glucose monitors seemingly agreed with overall capillary glucose trends but were less reliable for exact-value agreement.
Study context
- Population
- Participants without diabetes (young adults)
- Participants
- 39 participants
- Comparison
- OTC CGM vs capillary-meter glucose
- Outcome
- Agreement of OTC CGM with capillary-meter glucose
Methodological detailssessions combining rest or exercise with placebo or sugar-sweetened drink consumption
- Sessions combining rest or exercise with placebo or sugar-sweetened drink consumption
Main finding
As reported in the abstract
Agreement of OTC CGM with capillary-meter glucose (overall)
Overall mean absolute relative difference (MARD)
12.9%
Mean bias
−4.8 mg/dL
Within-15%/15-mg/dL agreement
66.5%
Further findings
MARD by drink: sugar vs placebo
P < 0.01
Exercise and glucose dynamics
- Exercise had no consistent effect
- Disagreement increased with faster rates of change and, less consistently, higher glucose
CGM delay
- MARD with uniform 5-minute delay
- 11.2% (P < .001)
- Population lag by cross-correlation
- 6.2-minute
Interparticipant differences
- Interparticipant agreement differed significantly, unattributable to measured biological variables
- Participant/device identity explained direction of error more than magnitude
- High-MARD participants did not have consistent high MARD across conditions
Safety
CGM change-indicator directional arrows classified as moderate to extreme risk
- Arrows classified as moderate to extreme risk
- 13.8%
Original publication
Agreement of Over-the-Counter Continuous Glucose Monitors With Capillary-Meter Glucose in Young Adults Without Diabetes. J Diabetes Sci Technol. Published 20 September 2026. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →