Continuous Glucose Monitors (CGMs) are wearable devices that measure blood sugar every few minutes — without finger pricks. They are transforming how people with diabetes monitor and manage their condition.
📊 What is a CGM?
A CGM consists of a tiny sensor inserted under the skin that measures glucose in the interstitial fluid. Data is transmitted wirelessly to a smartphone app every 1–5 minutes, 24 hours a day — giving you a continuous picture of your blood sugar trends.
✅ Key Benefits of CGM
- Continuous data: 288+ readings per day vs. 4–8 finger pricks
- Trend arrows: Know if glucose is rising fast, falling, or stable
- Automatic alerts: Warnings for hypoglycemia or hyperglycemia
- Night monitoring: Catches dangerous overnight lows while you sleep
- Better HbA1c: CGM users consistently achieve lower HbA1c levels
- No constant finger pricks: Much more comfortable
📱 Popular CGM Options in India
FreeStyle Libre (Abbott)
Most widely used in India. 14-day sensor, scan-based, no automatic alerts. Very affordable (~₹3,500/sensor).
Dexcom G6/G7
Real-time alerts, integrates with insulin pumps. Premium option, excellent for type 1 diabetics.
Medtronic Guardian
Works with Medtronic insulin pumps for semi-automated insulin delivery.
👩⚕️ Who Should Use a CGM?
- Type 1 diabetics — highly recommended
- Type 2 diabetics on insulin
- Anyone with frequent hypoglycemia (low blood sugar episodes)
- Pregnant women with gestational diabetes
- Those wanting deeper insight into how food/exercise affects glucose
Dr. Pavithra's Recommendation
CGMs are transformative, but they work best when you understand how to interpret the data. I recommend CGM for most patients on insulin, and for anyone struggling to achieve good HbA1c control. Book a consultation to discuss whether CGM is right for you.
Dr. Pavithra Thamizharasan
MBBS, MD, PG Diploma in Diabetes (Royal College of Physicians, UK) | Diabetes Specialist, Chennai
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