Reading Blood Sugar Levels and A1C
Make sense of your meter, your A1C and your CGM report, so every checkup feels clearer and less rushed.
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About this course
Make sense of your meter, your A1C and your CGM report, so every checkup feels clearer and less rushed.
Your meter, your A1C and your CGM report each tell part of your diabetes story. This course explains blood sugar ranges, fasting and after-meal readings, A1C, time in range and how to read a CGM report.
It also covers blood pressure and cholesterol, and how to talk through your numbers with your doctor so checkups feel clearer.
What you will learn
Medically reviewed by
Dr. Shanto Arian is an internal medicine physician now specializing in clinical and aesthetic dermatology, with a parallel academic focus on epidemiology and public health. He holds an MBBS, MPH, MSc (UK), MRCP (UK), MRCPI (Ireland), Diploma in Dermatology (UK), and Diploma in Aesthetic Medicine (USA). Dr. Arian trained in internal medicine, including hospital work on hematology cases such as graft-versus-host disease, before moving toward dermatology. Skin is one of the earliest places diabetes shows itself, from acanthosis nigricans and diabetic dermopathy to slow foot wound healing, and that intersection is where his clinical and Diabic-review work meet. On Diabic, Dr. Arian medically reviews content on diabetes diagnosis, complications, dermatologic manifestations, and pharmacotherapy, ensuring every claim aligns with current ADA, NICE, and peer-reviewed literature.
For learning only. Talk to your doctor before changing medicine or habits.
Chapter 1: Why Your Numbers Matter
- NIDDKThe A1C Test & Diabetes (opens in a new tab)
- Diabetes CareDiabetes Care article, volume 42 (opens in a new tab)
- NIDDKBlood Glucose Control Studies for Type 1 Diabetes: DCCT & EDIC (opens in a new tab)
- International Organization for StandardizationInternational Organization for Standardization standard page (opens in a new tab)
- American Diabetes AssociationAmerican Diabetes Association: About diabetes (opens in a new tab)
Chapter 2: Blood Sugar Ranges
- American Diabetes AssociationAmerican Diabetes Association: Diabetes diagnosis (opens in a new tab)
- American Diabetes AssociationAmerican Diabetes Association: Prediabetes (opens in a new tab)
- Mayo ClinicPrediabetes - Diagnosis and treatment (opens in a new tab)
- CDCDiabetes Testing (opens in a new tab)
Chapter 3: Fasting and After-Meal Readings
Chapter 4: A1C
Chapter 5: Time in Range
- Mayo ClinicHypoglycemia - Symptoms and causes (opens in a new tab)
- NIDDKLow Blood Glucose (Hypoglycemia) (opens in a new tab)
- National Library of MedicinePubMed article 30352896 (opens in a new tab)
- American Diabetes AssociationStandards of Care 2026, Diabetes Care, Standards of Care supplement 2026 (opens in a new tab)
Chapter 6: Reading a CGM Report
Chapter 7: Blood Pressure and Cholesterol
- NIDDKDiabetic Kidney Disease (opens in a new tab)
- American Heart AssociationAmerican Heart Association: Understanding blood pressure readings (opens in a new tab)
- American Heart AssociationAmerican Heart Association: Home monitoring, Monitoring your blood pressure at home (opens in a new tab)
- National Library of MedicinePosition paper, PubMed article 34269334 (opens in a new tab)
- American Heart AssociationAmerican Heart Association: Diabetes complications and risks (opens in a new tab)
- American Diabetes AssociationDiabetes Care, Standards of Care supplement 2025 (opens in a new tab)
- Mayo ClinicCholesterol: Top foods to improve your numbers (opens in a new tab)
- American Heart AssociationAmerican Heart Association: Aha recs for physical activity in adults (opens in a new tab)
Chapter 8: Talking About Your Numbers with Your Doctor
- NIDDKContinuous Glucose Monitoring (opens in a new tab)
- U.S. Department of Health and Human ServicesYour Rights Under HIPAA (opens in a new tab)
- American Diabetes AssociationAmerican Diabetes Association: Standards of Care, 6 glycemic goals and hypoglycemia in adults (opens in a new tab)
- Endocrine SocietyEndocrine Society: ADA consensus, Hyperglycemic crises in adults with diabetes (opens in a new tab)
Further reading on Diabic
- Glycohemoglobin A1C Test Results Explained
- A1C Normal Range: What Your Results Mean
- Time in Range for Diabetes: Why It Matters
- Glucose Variability Explained in Simple Terms
- AGP Report for Diabetes: A Visual Walkthrough
- CGM vs Glucometer: Which Should You Choose
- Normal Blood Sugar Levels Chart: Are You in Range?
- Is Your Blood Sugar in the Prediabetes Range?
- What Your Fasting Blood Sugar Number Actually Means
- Blood Sugar After Food: What's Normal
- Are Your Blood Sugar Levels Normal? Chart by Age
- Fasting vs Postprandial Glucose: What's the Difference
- 7 Ways to Prevent Blood Sugar Spikes After Meals
- What Food Causes High Blood Sugar (and Why)
- Glycohemoglobin A1C: Is Your Number Normal?
- What Your Prediabetes A1C Number Really Means
- Low Blood Sugar Symptoms That Hit Without Warning
- Blood Sugar Drops at Night: Causes and Prevention
- Dawn Phenomenon vs Somogyi Effect: Night Spikes
- Blood Pressure and Diabetes: Why Both Matter
- How Diabetes Causes High Blood Pressure
- Blood Pressure Target for Diabetes: Ideal Numbers
- 5 Ways to Lower High Cholesterol with Diabetes
- Reducing Your Diabetes Heart Attack Risk: A Practical Guide
- Sharing Diabetes Data Remotely With Your Doctor
- When to Go to the ER for Diabetes: A Triage Guide
- What Blood Sugar Level is Dangerous: the Signs