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Effect of Continuous Glucose Monitoring on Glycemic Control in Patients With Type 2 Diabetes Treated With Basal Insulin: A Randomized Clinical Trial
Open accessAbstract
Importance: Continuous glucose monitoring (CGM) has been shown to be beneficial for adults with type 2 diabetes using intensive insulin therapy, but its use in type 2 diabetes treated with basal insulin without prandial insulin has not been well studied. Objective: To determine the effectiveness of CGM in adults with type 2 diabetes treated with basal insulin without prandial insulin in primary care practices. Design, Setting, and Participants: This randomized clinical trial was conducted at 15 centers in the US (enrollment from July 30, 2018, to October 30, 2019; follow-up completed July 7, 2020) and included adults with type 2 diabetes receiving their diabetes care from a primary care clinician and treated with 1 or 2 daily injections of long- or intermediate-acting basal insulin without prandial insulin, with or without noninsulin glucose-lowering medications. Interventions: Random assignment 2:1 to CGM (n = 116) or traditional blood glucose meter (BGM) monitoring (n = 59). Main Outcomes and Measures: The primary outcome was hemoglobin A1c (HbA1c) level at 8 months. Key secondary outcomes were CGM-measured time in target glucose range of 70 to 180 mg/dL, time with glucose level at greater than 250 mg/dL, and mean glucose level at 8 months. Results: Among 175 randomized participants (mean [SD] age, 57 [9] years; 88 women [50%]; 92 racial/ethnic minority individuals [53%]; mean [SD] baseline HbA1c level, 9.1% [0.9%]), 165 (94%) completed the trial. Mean HbA1c level decreased from 9.1% at baseline to 8.0% at 8 months in the CGM group and from 9.0% to 8.4% in the BGM group (adjusted difference, -0.4% [95% CI, -0.8% to -0.1%]; P = .02). In the CGM group, compared with the BGM group, the mean percentage of CGM-measured time in the target glucose range of 70 to 180 mg/dL was 59% vs 43% (adjusted difference, 15% [95% CI, 8% to 23%]; P < .001), the mean percentage of time at greater than 250 mg/dL was 11% vs 27% (adjusted difference, -16% [95% CI, -21% to -11%]; P < .001), and the means of the mean glucose values were 179 mg/dL vs 206 mg/dL (adjusted difference, -26 mg/dL [95% CI, -41 to -12]; P < .001). Severe hypoglycemic events occurred in 1 participant (1%) in the CGM group and in 1 (2%) in the BGM group. Conclusions and Relevance: Among adults with poorly controlled type 2 diabetes treated with basal insulin without prandial insulin, continuous glucose monitoring, as compared with blood glucose meter monitoring, resulted in significantly lower HbA1c levels at 8 months. Trial Registration: ClinicalTrials.gov Identifier: NCT03566693.
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“Benefits of CGM in this population include reductions in A1C, fewer severe hypoglycemia events in children and adults, increased TIR, as well as significant reductions in hospitalizations for severe hypoglycemia and DKA.156,162–168”
From American Association of Clinical Endocrinology Clinical Practice Guideline: Developing a Diabetes Mellitus Comprehensive Care Plan-2022 Update. (2022) · cites this paper as [167]
Experimental — accuracy not yet measuredThe source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
In the citing paper
“Continuous glucose monitoring for adults with type 2 diabetes (both those using and not using insulin)24,25 also achieves improved glycated haemoglobin concentrations without impacting the rate of hypoglycaemia.”
From Blood glucose monitoring devices: current considerations (2023) · cites this paper as [24]
Experimental — accuracy not yet measuredThe source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
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“Randomized controlled trials of the use of rt-CGM, compared with standard blood glucose monitoring, in adults with type 2 diabetes have generally shown reductions in HbA 1c with no significant change in time in hypoglycemia (169-172).”
From Guidelines and Recommendations for Laboratory Analysis in the Diagnosis and Management of Diabetes Mellitus (2023) · cites this paper as [172]
Experimental — accuracy not yet measuredIn the citing paper
“RCT data on rtCGM use in individuals with type 2 diabetes on MDI (59), mixed therapies (10, 60), and basal insulin (61,62) have consistently shown reductions in A1C levels and increases in TIR (70-180 mg/dL [3.9-10 mmol/L]) but not a reduction in rates of hypoglycemia (63).”
From 7. Diabetes Technology: Standards of Care in Diabetes—2025 (2025) · cites this paper as [61]
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Boudreau, E. C., Rastegar, J. S., Swankoski, K. E., Hames, A., Mugavin, M. O., & Ross, J. S. (2026) · Journal of Managed Care & Specialty Pharmacy · doi:10.18553/jmcp.2026.32.3.329 · Cited by 1
Burden and Risk Factors of CGM ‐Detected Hypoglycemia in Older Adults With Type 2 Diabetes
Fang, M., Daya, N. R., Jeon, Y., Echouffo-Tcheugui, J. B., Windham, B. G., Zeger, S. L., & Selvin, E. (2026) · Journal of the American Geriatrics Society · doi:10.1111/jgs.70412 · Cited by 2
Pal, A. W., Chong, W. L., Huri, H. Z., & Ratnasingam, J. (2026) · Diabetic Medicine · doi:10.1111/dme.70360 · Cited by 1
“TIR serves as a vital, actionable metric for daily management, 7,35 aligning with current ADA guidelines recommending both HbA1c and TIR to assess glycae-mic control.”
InfluentialSummarizing data from continuous glucose monitors using the cgmstats command
Malek, N. D., Wang, D., Zhang, S., Fang, M., Wallace, A., Zeger, S. L., & Selvin, E. (2026) · The Stata Journal Promoting communications on statistics and Stata · doi:10.1177/1536867x261450271 · Cited by 1
Villanueva, G. P., Solorzano, W. M., & Everett, E. M. (2026) · Current Diabetes Reports · doi:10.1007/s11892-026-01631-8 · Cited by 2
Galindo, R. J., Moazzami, B., Gerges, A., Flores, I., Arevalo, G., Peng, L., de Boer, I. H., Tuttle, K. R., & Umpierrez, G. E. (2026) · Diabetes Care · doi:10.2337/dc26-0404 · Cited by 1
Self-citationPrimary Care–Initiated Continuous Glucose Monitoring in Adults With Insulin-Treated Diabetes
Milosavljevic, J., Leon, L. R., Rikin, S., Schechter, C. B., Hodgson, S., & Agarwal, S. (2026) · JAMA Network Open · doi:10.1001/jamanetworkopen.2026.21713 · Cited by 1
Cardiovascular–Kidney–Metabolic Syndrome: Models of Care
Chung, I., Fricska, D. I., Banerjee, S., Banerjee, P., Gomez-Johnson, V. H., Annear, N. M. P., Chaudhury, A. R., Chen, M., Anderson, L., & Banerjee, D. (2026) · Reviews in Cardiovascular Medicine · doi:10.31083/rcm47862 · Cited by 1
Surfactant-Assisted Colorimetric Signal Enhancement in Paper-Based Glucose Sensing
Kang, D., 이, 종., Bae, M., Roh, S., Cheong, D. Y., Lee, H., Lee, T., & Lee, G. (2026) · ACS Omega · doi:10.1021/acsomega.6c08985 · Cited by 1
Nontraditional Uses of Continuous Glucose Monitoring
Kapsar, P., Chao, C., & Walker, T. C. (2022) · The Journal for Nurse Practitioners · doi:10.1016/j.nurpra.2022.06.013 · Cited by 1
Primary Care and Diabetes Technologies and Treatments
Simonson, G. D., Martens, T. W., Carlson, A. L., & Bergenstal, R. M. (2023) · Diabetes Technology & Therapeutics · doi:10.1089/dia.2023.2510 · Cited by 1
“…is supported by the Diamond Study (3), and use in individuals on basal insulin regimens is supported by the MOBILE Study (published in the same issue of JAMA as this article) (5), but observational evidence for the use of CGM in individuals managing T2D on insulin has previously been limited.”
Self-citationOraibi, O., Somaili, M., Elmakki, E. E., Alqassimi, S., Madkhali, M. A., Mohrag, M., Abusageah, F., Alhazmi, M. K., Alfaifi, S. M., Ageeli, R., et al. (2023) · Endocrine Metabolic & Immune Disorders - Drug Targets · doi:10.2174/0118715303263019231029163336 · Cited by 1
Roadmaps to Continuous Glucose Monitoring’s Role in Transforming Diabetes Management
Bergenstal, R. M. (2023) · Diabetes Spectrum · doi:10.2337/dsi23-0007 · Cited by 1
Self-citationPrivate Sector Provision as an “Escape Valve”: The Mexico Diabetes Experiment
Bronsoler, A., B, J. G. A., & Seira, E. (2024) · The Review of Economic Studies · doi:10.1093/restud/rdae024 · Cited by 1
Insulin Delivery Hardware: Pumps and Pens
Lal, R., & Leelarathna, L. (2024) · Diabetes Technology & Therapeutics · doi:10.1089/dia.2024.2503 · Cited by 1
An Analysis of the Distribution of Direct Cost of Diabetes Care in Selected Districts in Italy
Mennini, F. S., Sciattella, P., Marcellusi, A., Bartolini, F., Bernardi, F. F., Levrat‐Guillen, F., Cozzolino, M., Gennaro, M. D., Giordana, R., Giustozzi, M., et al. (2024) · Diabetes Therapy · doi:10.1007/s13300-024-01580-z · Cited by 1
Salasa, W., Seredyński, T., Mądry, W., Mazurkiewicz, A., Kołodziej, M., Męczyńska, J., Saiuk, N., Kozicz, M. A., Wojciechowska, A., & Marcicka, J. (2024) · Journal of Education Health and Sport · doi:10.12775/jehs.2024.67.50885 · Cited by 1
Seufert, J., Dänschel, I., Gölz, S., Haller, N., Kulzer, B., Tan, S., Schnell, O., Wiesner, T., & Kroeger, J. (2024) · Diabetologie und Stoffwechsel · doi:10.1055/a-2305-9093 · Cited by 1
“%) gegenüber einer Abnahme in der SMBG-Gruppe (von 59% auf 43%, P <0,001) und signifikante prozentuale Abnahmen der TAR in der rtCGM-Gruppe (%TAR > 250 mg/dL) im Vergleich zur Zunahmen in der SMBG-Gruppe ( – 15 vs. 2, P <0,001) [25].”
Impact of Interfering Factors on a Glucose Sensor Model
Sabatini, A., Cenerini, C., Vollero, L., & Pau, D. P. (2024) · IEEE International Instrumentation and Measurement Technology Conference · doi:10.1109/i2mtc60896.2024.10561238 · Cited by 1
Insulin Pen Administration Efficacy and Safety in an Older Patient
Montgomery, D. K., Shin, T. R., & Newell, B. J. (2025) · The Senior Care Pharmacist · doi:10.4140/tcp.n.2025.64 · Cited by 1
Mind the Gap: Wearable Lactate and Glucose Monitors for Hospitalized Patients
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Considerations With Using a CGM in Older Individuals
Tadros, M., Sewell, H. E., & O’Neal, K. S. (2025) · The Senior Care Pharmacist · doi:10.4140/tcp.n.2025.283 · Cited by 1
Stewart, M. P., Loera, L. J., Onwukwe, B., Reveles, K. R., & Lin, K. P. (2025) · Journal of the American Pharmacists Association · doi:10.1016/j.japh.2025.102493 · Cited by 2
Achievement of time in range goals among patients with diabetes using continuous glucose monitoring
Azizi, F., Diehl, K., Enser, L., & Heacock, S. (2025) · Journal of the American Pharmacists Association · doi:10.1016/j.japh.2025.102924 · Cited by 1
Kim, J. Y., Ilham, S., Alshannaq, H. A., Pollock, R. F., Field, M., Norman, G. J., Jin, S., & Kim, J. H. (2025) · Journal of Diabetes Science and Technology · doi:10.1177/19322968251382570 · Cited by 1
Primary Care and Diabetes Technologies and Treatments
Simonson, G. D., Martens, T. W., Carlson, A. L., & Bergenstal, R. M. (2022) · Diabetes Technology & Therapeutics · doi:10.1089/dia.2022.2509 · Cited by 1
Self-citationMisdiagnosis of Type 1 Diabetes Identified at a Primary Care Pharmacist Visit
Goldman, J. D., & Sangave, N. A. (2022) · Clinical Diabetes · doi:10.2337/cd22-0049 · Cited by 1
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Metadata
- Authors
- Martens, T., Beck, R. W., Bailey, R., Ruedy, K. J., Calhoun, P., Peters, A. L., Pop-Busui, R., Philis-Tsimikas, A., Bao, S., Umpierrez, G., Davis, G., Kruger, D., Bhargava, A., Young, L., McGill, J. B., Aleppo, G., Nguyen, Q. T., Orozco, I., Biggs, W., Lucas, K. J., Polonsky, W. H., Buse, J. B., Price, D., Bergenstal, R. M., MOBILE Study Group, Carlson, A., Chambers, S., Yang, S., Kirkman, M. S., Kass, A., Fraser, R., Cushman, T., Ramos, C., Magar, M., Walker, M., Serafin-Dokhan, S., Salam, M., Hurst, S., Clifton, M. J., Kravarusic, J., Bansal, A., Fulkerson, C., Ang, L., Richardson, C., Mizokami-Stout, K., Reiss, J., Leone, V., Stifel, K., Dailey, G., Change, A., McCallum, J., Garcia, M. I., Davis, D., Lovell, C., Root, C., Toler, F., Wilhelm, L., Eifert, R., Murguia, L., Cota, B., Nguyen, L., Lipski, R., Lawrence, M. K., Fournier, A., Carter, M., Hoover, S., Cohen, N., Mouse, T., Rusnak, J., Campos, T., Njeru, N., Arant, T., Beck, S. E., & Balo, A.
- Affiliations
- Park Nicollet Health Services (US)
- Jaeb Center for Health Research (US)
- University of Southern California (US)
- University of Michigan, Ann Arbor
- Scripps Whittier Diabetes Institute, San Diego, California
- Vanderbilt University Medical Center (US)
- Emory University (US)
- Henry Ford Health (US)
- Iowa Diabetes Research, West Des Moines
- University of North Carolina at Chapel Hill (US)
- Washington University in St. Louis (US)
- Northwestern University (US)
- Las Vegas Endocrinology, Henderson, Nevada
- Carteret General Hospital (US)
- Amarillo Medical Specialists, Amarillo, Texas
- Diabetes & Endocrinology Consultants PC, Morehead City, North Carolina
- Behavioral Diabetes Institute, San Diego, California
- Dexcom (United States) (US)
- HealthPartners (US)
- for the MOBILE Study Group
- Corresponding author
- Beck, Roy W.
- ORCID
- Martens, Thomas
- Beck, Roy W.
- Bailey, Ryan
- Calhoun, Peter
- Peters, Anne L.
- Bao, Shichun
- Umpierrez, Guillermo
- Davis, Georgia
- Kruger, Davida
- Bhargava, Anuj
- Young, Laura
- McGill, Janet B.
- Aleppo, Grazia
- Polonsky, William H.
- Buse, John B.
- Price, David
- Bergenstal, Richard M.
- Carlson, Anders
- Yang, Shoua
- Kirkman, Marian Sue
- Serafin-Dokhan, Sara
- Salam, Maamoun
- Ang, Lynn
- Richardson, Caroline
- Leone, Virginia
- Dailey, George
- Hoover, Stephanie
- Cohen, Nathan
- Venue
- JAMA
- Publisher
- American Medical Association (AMA)
- Published
- 2021-06-08
- Volume
- 325
- Issue
- 22
- Pages
- 2262
- ISSN
- 0002-9955 (ISSN-L)
- 0098-7484
- PMC
- PMC8173473
- OpenAlex
- W3164064295
- Cited by
- 543
- References
- 23
- Citations by year
- 2026: 116 · 2025: 132 · 2024: 107 · 2023: 98 · 2022: 65 · 2021: 24
- FWCI
- 54.81
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- JAMA (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (UL1TR001422)
- National Institute of Diabetes and Digestive and Kidney Diseases (P30DK092926, P30DK020572, P30DK124723, P30DK111022)
- National Center for Advancing Translational Sciences
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Education
- Keywords
- continuous glucose monitoring, type 2 diabetes, basal insulin, glycemic control, HbA1c, blood glucose meters, time in target glucose range, primary care, intensive insulin therapy, glycemic variability, hypoglycemia, hyperglycemia, HbA1c reduction, HbA1c variability
- MeSH terms
- Glycemic Control, Aged, Blood Glucose, Diabetes Mellitus, Type 2, Female, Glycated Hemoglobin, Humans, Hypoglycemic Agents, Insulin, Male, Middle Aged, Time Factors, Confidence Intervals, Treatment Outcome, Patient Satisfaction, Sample Size, Postprandial Period
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