Buy a CGM in 2026: Physician’s Guide to Continuous Glucose Monitors

Introduction

The right CGM (continuous glucose monitor) for you depends on three things: your diabetes type, your insulin regimen, and your insurance status.

This physician-reviewed guide gives you specific device recommendations for your situation, plain-language explanations of CGM accuracy (MARD) and Time in Range (TIR), dated Medicare and private insurance coverage criteria, and 2026 cost comparisons.

Newly diagnosed? Use the Quick Match tool below to get a recommendation in 30 seconds.

Comparing Dexcom G7 vs FreeStyle Libre 3? Jump straight to the head-to-head comparison.

Checking insurance coverage? See the dated Medicare and private insurance criteria below.

Reviewed by Dr. Rishav Das, M.B.B.S. All device recommendations reference FDA-cleared systems and peer-reviewed clinical evidence, including JAMA, The Lancet, and ADA Standards of Care..

New to Glucose Monitoring? Key Terms Explained

• Blood Glucose = Your blood sugar level
• CGM = Continuous Glucose Monitor (wearable sensor that checks automatically) │
• Fingerstick/Meter = Traditional method (prick finger, test drop of blood) │
• MARD = Accuracy measurement (lower is better)
• A1C = 3-month average blood sugar test

Quick Summary: Which Glucose Monitor Should You Buy?

Who needs what:

• Type 1 or insulin-dependent Type 2 → Continuous Glucose Monitor (CGM) recommended
• Type 2 without insulin → Traditional finger-prick meter is usually sufficient
• Pregnant with gestational diabetes → Ask your doctor; usually meter 4x daily

Budget snapshot:

• Traditional meter: $15-$40 (test strips $0.35-$1.00 each)
• CGM: $100-$400/month without insurance; $0-$75/month with coverage

Top picks by category:

• Best overall CGM: Dexcom G7 (8.2% MARD, works with iPhone/Android)
• Best budget meter: Contour Next ($15, highly accurate)
• Best for kids: FreeStyle Libre 3 (14-day wear, discreet)

Insurance coverage: Most plans cover CGM if you use insulin 3+ times daily or have frequent low blood sugars.

Want the full details? Keep reading below.

Quick Recommendations Based on Your Situation:

If you’re newly diagnosed Type 1:
Start with Dexcom G7. Most insurance covers it, alerts prevent dangerous lows, and remote monitoring helps while you’re learning.

If you’re Type 2 not using insulin:
Contour Next meter is your best value. Test 1-2x daily to understand food impacts.

If you’re pregnant with gestational diabetes:
FreeStyle Libre 3 or traditional meter 4x daily. Discuss with your OB-GYN for specific protocol.

If you’re budget-conscious but use insulin:
Apply for FreeStyle Libre 3 with insurance (often $0-$50/month). Use manufacturer savings programs if needed.

If you’re a parent of a child with Type 1:
Dexcom G7 for remote monitoring peace of mind. Share readings with up to 10 family members.

CGM vs. Traditional Glucose Meter: Which Is Right for You?

A CGM (continuous glucose monitor) automatically measures glucose every 1–15 minutes via a wearable sensor, providing trend arrows, predictive alerts, and Time in Range data. A traditional fingerstick meter provides a single on-demand reading from a finger-prick blood sample, with no trend data and no alerts.

For insulin-dependent patients, CGM use is associated with significantly better glucose control and fewer dangerous lows compared to fingerstick-only monitoring (Beck et al., JAMA 2017; Lind et al., JAMA 2017). For Type 2 patients not using insulin, a traditional meter is typically sufficient at a fraction of the cost.

A CGM (continuous glucose monitor) automatically measures glucose every 1–15 minutes through a wearable sensor, giving you trend arrows, predictive low alerts, and Time in Range (TIR) data.

A traditional fingerstick meter requires a blood drop from a finger prick each time you test, giving you a single-point reading with no trend information.

For most insulin-dependent patients, a CGM provides significantly better glucose control and fewer dangerous lows than fingerstick testing alone.

For people with Type 2 diabetes who don’t use insulin, a traditional meter is often sufficient — and costs far less, typically $20–75 per month versus $130–300 per month for a CGM without insurance.

The table below breaks down how the two options compare across accuracy, cost, convenience, and the data you’ll see day to day.

Decision Factors:

Consider CGM if:

• Insulin-dependent (Type 1 or Type 2)
• Frequent hypoglycemia or hypoglycemia unawareness
• Desire for trend data and predictive alerts
• Insurance coverage available
• Comfortable with sensor wear and technology

Consider Traditional Meter if:

• CGM prescription criteria not met
• Non-insulin diabetes management
• Infrequent monitoring needs
• Cost is primary constraint
• Preference for on-demand testing

What this means for you: CGM users reduce nighttime low blood sugars by 72% on average and lower their A1C by 0.5-1.0% within 6 months. That translates to better sleep, fewer emergency situations, and reduced long-term complication risks. Most users report the biggest benefit isn’t the data—it’s the peace of mind.

Selecting an appropriate glucose monitoring system depends on your specific your type of diabetes, treatment regimen, and lifestyle factors. The table below outlines key considerations by condition type.

Type 1 Diabetes: CGM Requirements and Best Options

Individuals with Type 1 diabetes typically require the most frequent and detailed glucose monitoring due to absolute insulin deficiency and low blood sugar (hypoglycemia) risk.

Critical Features:

• Real-time alerts for low blood sugar (hypoglycemia) and rapid glucose changes
• Trend arrows showing rate and direction of glucose movement
• Data sharing capabilities for caregivers or healthcare providers
• Integration with insulin pumps or automated insulin delivery systems (where applicable)
• High accuracy across full glucose range (40-400 mg/dL)

Evidence Note: Studies suggest continuous glucose monitoring (CGM) is associated with improved blood sugar management and reduced hypoglycemia in Type 1 diabetes compared to fingerstick-only monitoring (1, 2). Randomized clinical trial on CGM effectiveness.

Studies including the DIAMOND and GOLD randomized controlled trials suggest continuous glucose monitoring (CGM) is associated with improved glycemic control and reduced hypoglycemia in Type 1 diabetes.

Type 2 Diabetes: When You Need a CGM vs. a Meter

Monitoring needs vary significantly based on treatment regimen and blood sugar management status.

Key Consideration: Insurance coverage for CGM in Type 2 diabetes may require demonstration of insulin use or specific blood sugar management challenges. Verify eligibility criteria with your insurer.

Prediabetes Monitoring

Monitoring in prediabetes serves primarily educational and behavioral modification purposes rather than immediate treatment decisions.

Monitoring Options:

• Periodic fingerstick testing (1-2 times weekly, varying times of day)
• Short-term CGM use (2-4 weeks) to identify glucose response patterns to meals and activity
• Laboratory A1C testing every 3-6 months as recommended by healthcare provider

Note: Most insurance plans do not cover glucose monitors for prediabetes. Out-of-pocket costs and prescription requirements vary.

Non-Diabetic and Biohacker Use: OTC CGM Options (Stelo, Lingo)

As of 2026, the FDA has cleared two continuous glucose monitors for over-the-counter (OTC) use by adults without diabetes — no prescription required.

Dexcom Stelo — a 15-day sensor designed for adults not on insulin who want to understand how diet, exercise, and sleep affect their glucose levels.

Abbott Lingo — a 14-day sensor that pairs with Abbott’s existing FreeStyle Libre sensor technology, aimed at general wellness and metabolic tracking.

Both devices are legal to purchase and use without a diabetes diagnosis. Insurance typically does not cover OTC CGMs for non-diabetic users, so expect to pay out of pocket.

What the evidence currently shows: Research into the health benefits of CGM use in people without diabetes is still emerging and not yet conclusive. If you’re using an OTC CGM to guide specific health decisions — rather than general curiosity — talk to your doctor about how to interpret the data.

Best Overall CGM: Dexcom G7

• MARD: 8.2% (highly accurate)
• Cost: $200-$300/month without insurance; $0-$75/month with coverage
• Best for: Type 1 diabetes, insulin-dependent Type 2, active lifestyles
• Key features: Real-time alerts, 10-day wear, works with iPhone/Android, shares data with up to 10 followers
• User rating: 4.7/5 from 3,200+ verified users

Most recommended by endocrinologists

Best Budget CGM: FreeStyle Libre 3

• MARD: 9.2%
• Cost: $130-$180/month without insurance; $0-$50/month with coverage
• Best for: Cost-conscious users, discreet monitoring
• Key features: 14-day wear, smallest sensor (coin-sized), optional real-time alerts
• User rating: 4.5/5 from 2,800+ users

Dexcom G7 vs. FreeStyle Libre 3: Which Should You Buy?

Dexcom G7 and FreeStyle Libre 3 are the two most widely prescribed CGMs in 2026. Here’s how they compare on the factors that matter most for a purchase decision:

Bottom line: Dexcom G7 has a slightly lower MARD (more accurate) and a longer water-resistance rating, but its 10-day sensor means more frequent replacements. FreeStyle Libre 3’s 14-day sensor and lower out-of-pocket cost make it a common choice for budget-conscious patients and for pediatric and elderly users where simplicity matters most.

Best CGM for Long-Term Use: Eversense E3 (180-Day Sensor)

Eversense E3 is an implantable CGM placed under the skin of the upper arm by a healthcare provider, lasting up to 180 days — significantly longer than the 10–14 day sensors used by Dexcom G7 and FreeStyle Libre 3.

It pairs with a removable smart transmitter worn on top of the skin and provides real-time glucose readings and alerts through a companion app.

Eversense E3 may be a good fit if you prefer fewer sensor changes overall, despite the in-office insertion and removal procedure required every 6 months.

Best Traditional Meter: Contour Next

• Accuracy: Exceeds FDA standards
• Cost: $15 for meter; test strips $0.35-$0.50 each
• Best for: Type 2 without insulin, budget-constrained, backup meter
• Key features: Second-chance sampling (no wasted strips), works in 5 seconds
• User rating: 4.8/5 from 1,500+ users

Best CGM for Kids With Type 1 Diabetes: FreeStyle Libre 3 (Abbott)

FreeStyle Libre 3 is one of the most widely prescribed CGMs for children with Type 1 diabetes, offering a 14-day sensor wear time, a MARD of 9.2%, real-time alerts, and remote monitoring through the LibreLinkUp app — allowing parents to view a child’s glucose readings from a separate device.

Its smaller sensor profile and lower cost relative to other CGMs make it a common first choice for pediatric patients.

Patients and caregivers commonly report that the sensor applicator causes a brief pinch lasting less than a second, comparable to or less uncomfortable than a daily fingerstick.

Best Glucose Monitor for Elderly Parents

If you’re choosing a glucose monitor for an aging parent, the priorities usually shift from “most data” to “easiest to use and easiest for you to monitor remotely.

FreeStyle Libre 3 is often a strong fit for this situation: it requires no fingerstick calibration, the sensor lasts 14 days, and the LibreLinkUp app lets an adult child or caregiver view glucose readings and receive low-glucose alerts remotely — without needing the parent to do anything beyond wearing the sensor.

For parents managing Type 1 diabetes or using insulin with frequent dosing adjustments, Dexcom G7 offers a shorter 10-day sensor with similarly simple remote-sharing through the Dexcom Follow app, and may be preferred if their care team is already managing them on Dexcom’s ecosystem.

Questions to ask before choosing:

• Does your parent’s insurance (including Medicare, if applicable) cover this specific device?
• Does the companion app require a smartphone, and does your parent — or you, remotely — have one?
• Does the device support a caregiver-following feature, and how many followers can it support?

Best CGM for Athletes and Active Users : Dexcom G7

Why: Sweat-resistant, real-time data during workouts, trend arrows show glucose direction
Athlete testimonial: “I can see exactly how my glucose responds during long runs and adjust my fuel intake in real-time.”

Real-Time Alerts and Hypoglycemia Prevention

Alert functionality may be critical for low blood sugar (hypoglycemia) prevention and glucose excursion awareness.

Customization Considerations:

Different times of day may require different alert thresholds. Some systems allow scheduled alert profiles (e.g., tighter ranges during waking hours, wider ranges overnight).

Evidence for Predictive Alerts: Clinical research on predictive low glucose management has demonstrated that predictive low glucose management systems can effectively reduce hypoglycemia events by providing advance warning 15-30 minutes before glucose reaches critical lows, allowing users to take preventive action.

How Accurate Is a CGM? Understanding MARD

MARD (Mean Absolute Relative Difference) is the standard accuracy metric for glucose monitors, measuring how closely device readings match laboratory blood values as a percentage, lower is more accurate.

Most current CGMs achieve 8–10% MARD. Laboratory-grade meters and the newest CGMs reach 5–8%. The FDA requires CGMs to meet below 15% MARD for regulatory clearance.

— Dr. Rishav Das, M.B.B.S., Wearable Wellness Guide (Last verified: June 2026)

MARD (Mean Absolute Relative Difference) measures how closely a CGM’s readings match laboratory blood values, expressed as a percentage — the lower the number, the more accurate the device.

Most current CGMs fall between 8–10% MARD; laboratory-grade meters and the newest CGMs achieve 5–8%. The FDA requires every CGM to demonstrate a MARD below 15% to receive regulatory clearance.

Last verified: June 2026 | Sources: FDA CGM guidance documentation; manufacturer pivotal trial data (Dexcom G7; FreeStyle Libre 3).

Accuracy in glucose monitoring is expressed as Mean Absolute Relative Difference (MARD). Lower MARD indicates higher accuracy.

What MARD means in practice: A 9% MARD means a CGM reading of 100 mg/dL could reflect an actual blood glucose anywhere from 91–109 mg/dL. If your symptoms don’t match your CGM reading, confirm with a fingerstick before making a dosing decision.

Accuracy Factors:

• Calibration accuracy (where applicable)
• Sensor or test strip age
• Body temperature
• Hydration status
• Medication interference (acetaminophen affects some CGMs)
• Insertion site quality

What Is Time in Range (TIR) and Why It Matters

Time in Range (TIR) is the percentage of the day a person’s glucose readings fall within their target range, typically 70–180 mg/dL for most adults with diabetes.

The American Diabetes Association recommends a TIR greater than 70% for most adults with Type 1 or Type 2 diabetes. CGMs calculate TIR automatically. Traditional fingerstick meters cannot, because they only capture isolated single-point readings.

— Dr. Rishav Das, M.B.B.S., Wearable Wellness Guide

Time in Range (TIR) is the percentage of the day your glucose readings fall within a target range — typically 70–180 mg/dL for most adults with diabetes. The American Diabetes Association (ADA) recommends a TIR greater than 70% for most adults with Type 1 or Type 2 diabetes.

CGMs calculate TIR automatically and display it in their companion apps. Traditional fingerstick meters cannot calculate TIR, because they only capture isolated, single-point readings rather than a continuous data stream.

Why TIR matters for your purchase decision: If your care team is focused on reducing time spent in hypoglycemia (low blood sugar) or hyperglycemia (high blood sugar), TIR is the metric they’ll track most closely — and it’s only available with a CGM, not a traditional meter.

— Dr. Rishav Das, M.B.B.S., Wearable Wellness Guide

Data Sharing and Remote Monitoring Capabilities

Data sharing allows caregivers, healthcare providers, or family members to remotely view glucose readings.

Privacy Considerations:

Understand who has access, what data they see, and how to revoke access. Some systems allow granular control (real-time vs. summary only).

Smartphone and Smartwatch Integration

Integration capability affects convenience and data accessibility.

Compatibility Verification:

Check specific device/phone/watch model compatibility before purchase. Operating system version requirements may exclude older phones.

Medical Criteria for a CGM Prescription

Most CGM systems require a prescription. Traditional meters often do not, though test strip coverage may require prescription.

Typical Prescription Criteria for CGM:

• Diagnosed diabetes (Type 1 or Type 2)
• Insulin use (required by most insurers for Type 2)
• Demonstrated need for intensive monitoring
• Completion of diabetes self-management education (some insurers)
• Healthcare provider assessment of patient capability to use device

Prescription Process:

Healthcare providers typically assess monitoring needs during routine diabetes visits. If CGM is appropriate, the prescription specifies device type and supply quantities.

Some CGM manufacturers offer prescription support services to facilitate the process with your provider.

How to Request a CGM Prescription (Step-by-Step)

1. Primary Care or Endocrinologist:

Most prescriptions originate from your regular diabetes care provider. Endocrinologists (diabetes specialists) may have more experience with CGM prescription and troubleshooting.

2.Telehealth Services:

Some telehealth platforms specialize in diabetes care and can issue CGM prescriptions following virtual consultation. Verify that your insurance accepts telehealth prescriptions for durable medical equipment.

3. Diabetes Education Programs:

Certified diabetes educators (CDEs) can provide training but typically cannot prescribe devices. They work with your physician to facilitate the prescription.

Does Private Insurance Cover CGM?

Most private insurance plans cover glucose monitoring supplies for diagnosed diabetes, with varying coverage levels for CGM vs. traditional meters.

Typical Coverage Patterns:

Prior Authorization Process:

Prior authorization typically requires:

• Prescription from healthcare provider
• Documentation of diabetes diagnosis
• Evidence of insulin use (for Type 2 CGM coverage)
• Medical necessity justification
• Proof of diabetes education completion (sometimes)

Approval Timeline:

Prior authorization decisions typically take 3-14 days. Expedited review may be available for urgent medical need.

Appeals:

If coverage is denied, most insurers allow appeals with additional medical documentation. Success rates improve with detailed provider justification of medical necessity.

Does Medicare Cover CGM? Coverage Criteria as of 2026

As of January 2026, Medicare Part B covers continuous glucose monitors for beneficiaries who: (1) have a confirmed diabetes diagnosis, (2) use insulin via multiple daily injections or an insulin pump, (3) require frequent insulin adjustments based on monitoring, (4) completed diabetes self-management training within the past 6 months, and (5) had an in-person physician visit within 6 months of the CGM order.

After the Part B deductible, beneficiaries typically pay 20% of the Medicare-approved amount.

Source: CMS CGM Coverage Determination Policy. Last verified: June 2026.

As of January 2026, Medicare Part B covers continuous glucose monitors for beneficiaries who meet all of the following criteria:

• Have a confirmed diagnosis of Type 1 or Type 2 diabetes.
• Use insulin via multiple daily injections or an insulin pump.
• Require frequent adjustments to their insulin regimen based on glucose readings.
• Have completed diabetes self-management training within the past 6 months.
• Had an in-person visit with the prescribing physician within 6 months of the CGM order.
• After meeting the Part B deductible, beneficiaries typically pay 20% of the Medicare-approved amount for CGM supplies. Medicare classifies CGMs under Durable Medical Equipment (DME) benefits, which affects how your supplier bills and how often supplies can be replaced.

Source: CMS CGM Coverage Determination Policy. Last verified: June 2026.

Traditional Meter Coverage:

Medicare covers meters, test strips, and lancets for beneficiaries with diabetes. Coverage limits depend on insulin use:

• Insulin users: Up to 300 test strips and 300 lancets per month
• Non-insulin users: Up to 100 test strips and 100 lancets per month

CGM Coverage:

Medicare covers CGM for beneficiaries who meet specific criteria:

• Diabetes diagnosis (Type 1 or Type 2)
• Insulin treatment with multiple daily injections or insulin pump
• Frequent glucose adjustments based on monitoring
• Completed diabetes self-management training within 6 months
• In-person visit with prescribing physician within 6 months before CGM order

Cost Sharing:

After meeting Part B deductible, beneficiaries typically pay 20% of the Medicare-approved amount.

CGM vs. Meter Cost Comparison Without Insurance

For those without insurance coverage or choosing to pay directly:

Traditional Meter Costs (monthly estimates):

• Meter device: $20-$75 (one-time)
• Test strips: $10-$150 per month (depending on testing frequency and brand)
• Lancets: $5-$15 per month
• Control solution: $5-$10 per bottle (lasts several months)

CGM Costs (monthly estimates without insurance):

• Initial receiver/transmitter: $200-$500 (one-time or annual)
• Sensors: $150-$500 per month (depending on sensor duration and system)
• Applicator (if separate): Included or $10-$30

Cost Reduction Strategies:

Generic or store-brand test strips often cost significantly less than name-brand strips. Verify meter compatibility.

Less frequent testing (where medically appropriate) reduces supply costs.

Consider systems with longer sensor wear time (14 days vs. 10 days) to reduce monthly sensor costs.

Manufacturer Savings Programs and Patient Assistance

Most major glucose monitor manufacturers offer patient assistance programs for those without adequate insurance coverage or facing high cost sharing.

Typical Program Structures:

• Free initial device (meter or CGM receiver)
• Discounted sensors or test strips
• Free trial programs (30-90 days of supplies)
• Income-based sliding scale discounts

Eligibility Requirements:

Eligibility varies by manufacturer but commonly includes:

• Valid prescription for the device
• Lack of adequate insurance coverage OR high out-of-pocket costs despite insurance
• Income limits (for some programs)
• U.S. residency

Application Process:

Programs typically require:

• Completed application form (available on manufacturer website)
• Proof of income (tax returns, pay stubs)
• Insurance denial letter or explanation of benefits (if applicable)
• Prescription from healthcare provider

Important Limitations:

Savings programs are manufacturer-funded and subject to change or discontinuation. Program terms, eligibility, and benefits should be verified directly with the manufacturer at time of enrollment.

Cheapest CGM Options Without Insurance in 2026

If you don’t have insurance coverage for a CGM, here’s how the most common options compare on monthly out-of-pocket cost:

Manufacturer savings programs — Dexcom Patient Solutions and FreeStyle Promise — can reduce out-of-pocket costs for eligible patients even without insurance. Check eligibility directly with the manufacturer, as income and insurance-status requirements vary.

Best CGM for Children With Type 1 Diabetes

Glucose monitoring in children requires additional considerations for age-appropriate use, school settings, and caregiver involvement.

Age-Specific Considerations:

School Setting Requirements:

Children with diabetes in school settings require coordination between parents, school nurses, and teachers:

• 504 Plan or IEP: Legal accommodation for glucose monitoring during school
• Diabetes Medical Management Plan: Healthcare provider documentation of monitoring needs
• Trained personnel: School staff trained in glucose monitoring assistance and emergency response
• Device accessibility: Immediate access to monitoring equipment in classroom (not locked away)
• Data sharing setup: Real-time alerts to parents/caregivers during school hours

Device Selection Factors for Children:

• Durability (withstand active play)
• Discreteness (minimizes social attention if child prefers)
• Remote monitoring capability (parent peace of mind)
• Alert customization (appropriate for school/sleep settings)
• Age-appropriate interface (if child will operate device)

Developmental Considerations:

Young children cannot articulate hypoglycemia symptoms reliably, increasing importance of predictive alerts. Adolescents may resist constant monitoring; involve them in device selection to improve adherence.

Best CGM for Pregnancy and Gestational Diabetes

Glucose monitoring during pregnancy requires tighter targets and more frequent monitoring than non-pregnant diabetes management.

Monitoring Intensity During Pregnancy:

Pregnant individuals with pre-existing diabetes (Type 1 or Type 2) typically require:

• More frequent glucose monitoring (6-10 times daily with traditional meter)
• CGM strongly considered for trend awareness and tight control
• Overnight monitoring to detect nocturnal hypoglycemia

Pregnancy-Specific Glucose Targets:

Target ranges during pregnancy are tighter than standard diabetes targets. Typical recommendations (verify with your healthcare provider):

• Fasting: 60-95 mg/dL
• 1-hour post-meal: <140 mg/dL
• 2-hour post-meal: <120 mg/dL

Evidence Note: Studies suggest CGM use during pregnancy with Type 1 diabetes is associated with improved maternal glucose control and better neonatal outcomes compared to self-monitoring alone (3, 4). Clinical trial demonstrating improved neonatal outcomes

Gestational Diabetes Monitoring:

Individuals diagnosed with gestational diabetes during pregnancy typically start with traditional fingerstick monitoring (4 times daily: fasting and post-meal). CGM may be recommended if glucose control is challenging or insulin is required.

Device Considerations for Pregnancy:

• Alert customization for tighter targets
• Data sharing with healthcare team for close monitoring
• Compatibility with frequent ob-gyn visits and glucose data review
• Ease of use during physical changes of pregnancy

Important: Pregnancy glucose management requires close collaboration with healthcare providers. Monitoring decisions should be made jointly with your obstetric and endocrinology care teams.

Best CGM for Athletes and Active Lifestyles

Physical activity significantly affects glucose levels. Monitoring considerations differ for recreational exercise vs. athletic training.

Exercise-Related Glucose Challenges:

• Delayed hypoglycemia (glucose drops hours after intense exercise)
• Exercise-induced hyperglycemia (high-intensity activity can temporarily raise glucose)
• Increased insulin sensitivity following exercise
• Variability in glucose response to different activity types

CGM Advantages for Exercise:

• Real-time trending during activity
• Rate-of-change alerts prevent mid-exercise hypoglycemia
• Pattern identification for pre-exercise fueling strategies
• Post-exercise monitoring for delayed hypoglycemia prevention

Device Durability Considerations:

• Water resistance (swimming, water sports)
• Adhesive strength (sweating, movement)
• Impact resistance (contact sports)
• Compression resistance (CGM sensors can give falsely low readings under pressure)

Practical Strategies:

• Additional adhesive overlay for sensor security during activity
• Verify device is secure before exercise
• Test glucose before, during (if duration >60 minutes), and after exercise
• Understand your individual glucose response patterns to different activities

Alert Customization:

Consider temporary alert threshold adjustments during exercise (higher low-glucose alert) to reduce nuisance alarms while maintaining safety.

Best Glucose Monitor for Elderly Parents

If you’re choosing a glucose monitor for an aging parent, the priorities usually shift from “most data” to “easiest to use and easiest for you to monitor remotely.”

FreeStyle Libre 3 is often a strong fit for this situation: it requires no fingerstick calibration, the sensor lasts 14 days, and the LibreLinkUp app lets an adult child or caregiver view glucose readings and receive low-glucose alerts remotely — without needing the parent to do anything beyond wearing the sensor.

For parents managing Type 1 diabetes or using insulin with frequent dosing adjustments, Dexcom G7 offers a shorter 10-day sensor with similarly simple remote-sharing through the Dexcom Follow app, and may be preferred if their care team is already managing them on Dexcom’s ecosystem.

Questions to ask before choosing:

• Does your parent’s insurance (including Medicare, if applicable) cover this specific device?
• Does the companion app require a smartphone, and does your parent — or you, remotely — have one?
• Does the device support a caregiver-following feature, and how many followers can it support?

Common Questions About Buying a CGM (Answered)

Does a CGM Hurt?

CGM sensors use a small 4–5mm applicator needle that most users describe as a brief pinch lasting less than a second — typically less uncomfortable than a daily fingerstick.

Once placed, the sensor sits flush against the skin for 10–14 days without ongoing discomfort.

I’m Not Tech-Savvy — Can I Still Use a CGM?

Most current CGMs are designed for one-time setup: apply the sensor, pair it with a smartphone app, and readings appear automatically.

No ongoing calibration is required for Dexcom G7 or FreeStyle Libre 3.

Will People Notice My CGM?

CGM sensors are roughly the size of a quarter and worn on the back of the upper arm or abdomen.

They can be covered by clothing and are generally not noticeable unless pointed out.

What If I Don’t Like My CGM After Buying It?

Many manufacturers offer trial or sample programs through your prescriber before committing to a monthly supply order.

Ask your doctor whether a starter kit is available before your first full prescription fill.

What If My Insurance Doesn’t Cover My CGM?

If your plan doesn’t cover your first-choice device, manufacturer savings programs (Dexcom Patient Solutions, FreeStyle Promise) and OTC options (Stelo, Lingo) may reduce your out-of-pocket cost.

See the insurance and cost sections below.

Device Usage Errors

Data Interpretation Mistakes

When to Consult a Healthcare Provider

Seek professional guidance for:

• Determining appropriate glucose monitoring intensity and device type for your condition
• Obtaining necessary prescriptions and insurance documentation
• Interpreting glucose patterns and adjusting treatment based on monitoring data
• Addressing persistent hypoglycemia or hyperglycemia despite monitoring
• Experiencing concerning symptoms inconsistent with glucose readings
• Deciding whether to initiate, continue, or discontinue glucose monitoring
• Navigating insurance coverage challenges or medical necessity documentation

This guide provides educational information only, in accordance with our medical safety policy. All monitoring decisions should be made in consultation with qualified healthcare providers familiar with your individual medical history and needs.

This content was developed independently. See our conflict of interest disclosure.

Reviewed according to the medical standards outlined on our About page.

Take the next step:

→ Compare CGM Systems Side-by-Side

See Dexcom G7, FreeStyle Libre 3, and Eversense E3 compared by accuracy, cost, and insurance coverage.

→ Download Our Doctor Discussion Guide

Bring this to your next appointment to request a CGM prescription with the documentation your insurer needs.

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Affiliate disclosure: This site may earn a commission on purchases made through links on this page. All recommendations are independently developed by Dr. Rishav Das, M.B.B.S. See our conflict of interest disclosure.

References

1. Beck RW, et al. Effect of Continuous Glucose Monitoring on Glycemic Control in Adults With Type 1 Diabetes Using Insulin Injections: The DIAMOND Randomized Clinical Trial. JAMA. 2017;317(4):371-378.
   
2. Lind M, et al. Continuous Glucose Monitoring vs Conventional Therapy for Glycemic Control in Adults With Type 1 Diabetes Treated With Multiple Daily Insulin Injections: The GOLD Randomized Clinical Trial. JAMA. 2017;317(4):379-387.
   
3. Petrie JR, et al. Improving the efficacy of continuous glucose monitoring: use of predictive low glucose management. Lancet Diabetes Endocrinol. 2015;3(5):327-329.
   
4. Feig DS, et al. Continuous glucose monitoring in pregnant women with type 1 diabetes (CONCEPTT): a multicentre international randomised controlled trial. Lancet. 2017;390(10110):2347-2359.
   

Additional clinical guidance sources:

• Centers for Medicare & Medicaid Services coverage determination policies
• American Diabetes Association Standards of Care in Diabetes (updated annually)
• FDA guidance on continuous glucose monitoring systems