CGM Lowers A1C Faster Than Finger Sticks in Type 2

What This Study Found

Adults with type 2 diabetes who used a continuous glucose monitor (CGM) instead of a traditional finger-stick meter saw their A1C drop significantly faster — by an extra 0.6 percentage points in just 3 months. The CGM group also spent about 9% more time in the healthy blood sugar range (70–180 mg/dL). Importantly, they had fewer low blood sugar events, not more.

Why This Matters for You

If you take basal insulin (a long-acting insulin like glargine or detemir) for type 2 diabetes, you may be checking your blood sugar with a finger-stick meter once or twice a day. That gives you a snapshot — but only at the exact moment you test. A CGM reads your glucose every few minutes, all day and night, and shows you the full picture.

This study suggests that simply seeing more of your glucose data helps you and your doctor make better decisions faster. In fact, the CGM group started showing improvements within the first 7 days of use.

About the MOBILE Study

Researchers enrolled 175 adults with type 2 diabetes who were all using basal insulin but not mealtime insulin. Participants were randomly assigned to either:

• CGM group (116 people) — used a real-time continuous glucose monitor
• Finger-stick group (59 people) — used a traditional blood glucose meter

After 3 months, the results were clear. The CGM group's average A1C dropped from 9.1% to 8.0%. The finger-stick group's A1C dropped from 9.0% to only 8.5%. That 0.6% difference may sound small, but in diabetes care, it can meaningfully reduce the risk of complications over time.

The Safety Win: Fewer Lows

One concern people often have about trying to lower blood sugar is the risk of hypoglycemia (low blood sugar). This study found the CGM group actually had fewer hypoglycemic episodes per week than the finger-stick group. CGM alerts you when your glucose is dropping, so you can act before it becomes a problem.

What This Means in Plain Terms

You don't have to change your insulin, your diet, or your exercise routine to benefit. Just upgrading how you monitor your glucose can lead to real improvements — quickly. This study suggests CGM is a powerful tool even for people with type 2 diabetes who aren't on complex insulin regimens.

Talk to Your Care Team

If you use basal insulin and still rely on finger sticks, ask your doctor or diabetes educator whether a CGM is right for you. Many people are surprised to learn they may qualify for coverage.

MDS Diabetes carries a full range of CGM supplies and diabetes monitoring products. Visit mdsdiabetes.com to explore your options.

Full Citation

Martens, Beck, Griffen (2025). Rapid improvements in glycemic management with use of continuous glucose monitoring in adults with type 2 diabetes treated with basal insulin: 3-month analysis of the MOBILE study. BMJ Open Diabetes Research & Care. PMID: 41192933. DOI: 10.1136/bmjdrc-2025-005469