Diabetes & metabolic health · 5 min read · Evidence-informed guide
Continuous Glucose Monitors: Questions to Ask
A continuous glucose monitor (CGM) measures glucose in fluid just below the skin and sends readings to a receiver or app. It can help some people understand glucose patterns, but device choice, training, coverage, and targets should be individualized with a clinician.
Key answer
The short version
A continuous glucose monitor (CGM) measures glucose in fluid just below the skin and sends readings to a receiver or app. It can help some people understand glucose patterns, but device choice, training, coverage, and targets should be individualized with a clinician.
What a CGM can show
CGMs provide trends, alerts, and time-in-range information in addition to individual readings. A CGM is not the same as a diagnostic test for prediabetes or diabetes.
Selection is individual
The ADA recommends individualizing diabetes technology based on needs, circumstances, preferences, and skill level. Training and an ongoing plan for using the data are important.
Coverage is not guaranteed
Coverage rules differ by plan and can change. Confirm eligibility, prescription requirements, and out-of-pocket costs with your insurer and care team.
Clinical perspective
How to think about this
A CGM can create a great deal of data. Its value lies not in chasing every fluctuation, but in recognizing meaningful patterns and using them with a care team to make safer, more informed decisions.
Questions worth bringing to a visit
- What question would a CGM help answer in my care?
- Which alerts and targets are appropriate for me?
- How should I respond to a reading that does not match how I feel?
Continue exploring
Related patient questions
Sources
1. CDC, Continuous Glucose Monitors
CGM function, use, and coverage context.
2. ADA, Diabetes Technology—2026
Individualized technology guidance.