How to Read and Use an AGP Report: A Complete Guide to Interpreting Continuous Glucose Monitoring Data
1. What Is AGP and Why Was It Developed
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AGP (Ambulatory Glucose Profile) is a standardized graphical report based on CGM data.
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Developed in 1987 to simplify glucose trend interpretation.
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Officially standardized in 2008 by the International Diabetes Center.
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Endorsed in CGM consensus guidelines since 2013 and included in ADA Standards since 2020.
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Purpose: Make glucose data more visual, comparable, and clinically useful.
2. Structure of the AGP Report
The AGP report includes three core sections:
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Glucose Metrics Summary: Quantitative indicators for glycemic control.
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24-hour Glucose Profile Graph: Visual trend showing average daily patterns.
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Daily Views: Help identify intra-day variability and outliers.
Focus: The metrics summary gives the clearest overview of overall glycemic status.
3. Understanding the 10 Key Metrics
Grouped into three categories:
A. Data Quality Metrics
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Wear Days & Sensor Activity % → Reliable CGM data requires ≥14 days and ≥70% active time.
B. Glucose Control Overview
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Mean Glucose
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GMI (Glucose Management Indicator): Replaces eA1c; target <7%.
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Glycemic Variability (CV%): Target <36% to reduce complication risks.
C. Range-Based Metrics
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TIR (Time in Range: 70–180 mg/dL): Target ≥70%.
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TAR (Time Above Range): >180 and >250 mg/dL tracked.
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TBR (Time Below Range): <70 and <54 mg/dL tracked. → Use all three together to evaluate risks of both hyper- and hypoglycemia.
4. How to Adjust Targets for Different Populations
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Standard targets: TIR ≥70%, TBR <4%, GMI <7% (most adults with T1 or T2 diabetes)
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Elderly or high-risk individuals: TIR ≥50%, TBR <1%
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Pregnancy (Type 1 Diabetes): TIR ≥70%, target range tightened to 63–140 mg/dL
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Gestational or T2D in pregnancy: Guidelines still evolving; no fixed TIR yet
Always tailor interpretation based on age, condition, and comorbidities.