Metabolic
CGM time in range
The percentage of CGM readings within a defined glucose range.
What it measures
Continuous interstitial glucose values summarized over time.
Why it matters
Validated for diabetes management and complements A1C by showing patterns and variability.
How to interpret it
Use adequate sensor wear and disease-specific consensus targets.
Important limitations
Evidence is insufficient to use CGM for diagnosis of prediabetes/diabetes, and targets developed for diabetes should not be automatically applied to healthy people.
Evidence status
Clinical biomarker
Clinically validated in diabetes management; consumer longevity interpretation outside diabetes is much less established.
Research & guidance
Original papers, validation studies, reviews and clinical guidance connected to this measurement.
clinical guideline
Standards of Care in Diabetes—2026: Glycemic Goals, Hypoglycemia, and Hyperglycemic Crises
Diabetes Care · 2026
Defines clinical CGM metrics and their role in diabetes management.
clinical guideline
Standards of Care in Diabetes—2026: Diagnosis and Classification of Diabetes
Diabetes Care · 2026
Notes insufficient evidence for CGM as a screening or diagnostic test for prediabetes or diabetes.
For education and evidence exploration, not diagnosis or individualized medical advice.