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FreeStyle Libre 3 Plus

Abbott

Abbott's flagship sensor: the world's smallest and thinnest CGM, factory- calibrated, with 15-day wear and real-time minute-by-minute readings. An iCGM that now drives several AID systems. It has replaced the original Libre 3.

Available nowRegulator-approvedcgm

The scorecard

Accuracy85

15-day MARD 8.2% (adults) / 8.1% (children 6–17); strong in the hypo range — ~97–98% of readings within ±15 mg/dL of reference.[1]

Low lag65

Reads interstitial fluid, so the ~10-min physiological lag is inherent to the sensing category, not a Libre-specific flaw.[3]

Interoperability78

An iCGM that now drives the iLet, Tandem t:slim X2 (Control-IQ+), and twiist AID systems; ecosystem expanding fast but still narrower than Dexcom and thin on open-source loop support.[11]

Sensor lifespan85

Up to 15-day wear — the longest of the mainstream patch CGMs.[1]

No calibration95

Factory-calibrated; no fingerstick calibration required.[6]

Alerts & prediction80

Streams a reading every minute to the phone with optional configurable high/low alarms; predictive alerting is less extensive than some rivals.[4]

Form factor92

World's smallest and thinnest sensor (about two stacked pennies), one-piece applicator, 60-minute warm-up.[4]

Ketone sensing0

No ketone sensing — glucose only. (Abbott has a dual glucose-ketone sensor in development, tracked separately.)

Access & cost80

Reimbursed in 37+ countries, historically lower-cost than rivals, and available via pharmacy pay-as-you-go; a major access advantage.[4]

The full picture

The FreeStyle Libre 3 Plus is Abbott's flagship continuous glucose monitor (CGM) — a small, round sensor you wear on the back of your upper arm that reads the glucose in the fluid just under your skin and sends a new value to your phone (or the Libre 3 reader) automatically every minute.1 It is factory-calibrated, so there are no fingerstick calibrations to do.2 It replaces the original Libre 3: in the UK the older sensor is being phased out by the end of March 2026, and the Plus is what new and existing users move to.3

Accuracy. In Abbott's pivotal study the 15-day sensor had a mean absolute relative difference (MARD — lower is better) of 8.2% in adults and 8.1% in children aged 6–17.4 The original Libre 3 was the first CGM to post a sub-8% MARD (7.9%),5 and in an independent head-to-head it was more accurate than the Dexcom G7 (8.9% vs 13.6%).6 Reassuringly, it holds up in the low range, with roughly 97–98% of readings within ±15 mg/dL of the lab reference in the hypo zone.4 As with every current sensor, it reads interstitial fluid, so there is a short (~10-minute) physiological lag and accuracy can dip during fast changes such as exercise.7

Wear, warm-up, calibration. Up to 15 days per sensor — the longest of the mainstream patch CGMs — with a 60-minute warm-up and no calibration.2 It is water-resistant to 1 m for up to 30 minutes.2

Alerts. Readings stream to the phone every minute, with optional, configurable high and low glucose alarms.5

What it works with. The Libre 3 Plus is an iCGM (an interoperable CGM cleared to feed automated systems) for ages 2 and up.8 It now drives three automated insulin delivery (AID) systems: the Beta Bionics iLet (the first US system to connect to it),9 the Tandem t:slim X2 with Control-IQ+,10 and Sequel's Tidepool-powered twiist.11 It pairs with the FreeStyle Libre 3/3 Plus app on compatible iPhones and Android phones, plus LibreLinkUp for caregivers and LibreView for clinicians.2 Support in open-source DIY loops is still limited compared with Dexcom.

Ketones. None — this sensor measures glucose only. (Abbott has a separate dual glucose-ketone sensor in development, tracked elsewhere on this site.)

Who it's for, access, and cost. Indicated for people with diabetes aged 2 and older.8 Abbott's Libre platform is reimbursed in 37+ countries — including the US, UK, EU markets, Canada, Japan and Australia — and is positioned as a lower-cost option, historically around a third the price of some rivals, available via pharmacy pay-as-you-go.5 In the UK it is supplied on the NHS.3

What's coming. The bigger AID ecosystem is the near-term story: t:slim X2 + Libre 3 Plus is rolling out internationally through 2026,10 and twiist integration is launching.11 The frontier feature for the Libre line is dual glucose-and-ketone sensing, which Abbott has in development.

References

  1. Abbott. Meet the FreeStyle Libre 3 Plus sensor. Abbott (n.d.). https://www.freestyle.abbott/us-en/products/freestyle-libre-3.html ↩

  2. Abbott. Meet the FreeStyle Libre 3 Plus sensor. Abbott (n.d.). https://www.freestyle.abbott/us-en/products/freestyle-libre-3.html ↩ ↩2 ↩3 ↩4

  3. Diabetes UK. FreeStyle Libre 3 sensors will be phased out and replaced with FreeStyle Libre 3 Plus. Diabetes UK (2025). https://www.diabetes.org.uk/about-us/news-and-views/freestyle-libre-3-sensors-will-be-phased-out-replaced-freestyle-libre-3-plus ↩ ↩2

  4. Alva S, et al. Accuracy of a 15-day Factory-Calibrated Continuous Glucose Monitoring System With Improved Sensor Design. J Diabetes Sci Technol (2025). PMID 40183340. https://pmc.ncbi.nlm.nih.gov/articles/PMC11977615/ ↩ ↩2

  5. Abbott. Abbott's FreeStyle Libre 3 Receives U.S. FDA Clearance — World's Smallest, Thinnest and Most Accurate 14-Day Glucose Sensor. PR Newswire (2022). https://www.prnewswire.com/news-releases/abbotts-freestyle-libre-3-receives-us-fda-clearance--features-worlds-smallest-thinnest-and-most-accurate-14-day-glucose-sensor-301557561.html ↩ ↩2 ↩3

  6. Hanson K, Kipnes M, Tran H. Comparison of Point Accuracy Between Two Widely Used Continuous Glucose Monitoring Systems. J Diabetes Sci Technol (2024). PMID 38189290. https://pmc.ncbi.nlm.nih.gov/articles/PMC11089878/ ↩

  7. Maytham K, et al. Accuracy of continuous glucose monitoring during exercise-related hypoglycemia in individuals with type 1 diabetes. Front Endocrinol (Lausanne) (2024). PMID 38686202. https://pmc.ncbi.nlm.nih.gov/articles/PMC11057372/ ↩

  8. U.S. Food and Drug Administration. 510(k) K233537 — FreeStyle Libre 3 Continuous Glucose Monitoring System. FDA (2024). https://www.accessdata.fda.gov/cdrh_docs/pdf23/K233537.pdf ↩ ↩2

  9. Beta Bionics. Beta Bionics Launches the iLet Bionic Pancreas With Abbott's FreeStyle Libre 3 Plus Sensor. Drug Delivery Business News (2024). https://www.drugdeliverybusiness.com/beta-bionics-launches-ilet-abbott-libre/ ↩

  10. Tandem Diabetes Care. t:slim X2 Insulin Pump Now Available With Abbott's FreeStyle Libre 3 Plus Sensor in the United States. HIT Consultant (2025). https://hitconsultant.net/2025/10/30/tandem-diabetes-care-launches-tslim-x2-pump-integration-with-abbott-freestyle-libre-3-plus/ ↩ ↩2

  11. Sequel Med Tech. Sequel Announces First CGM Integration for its twiist AID System: Abbott's FreeStyle Libre 3 Plus Sensor. GlobeNewswire (2025). https://www.globenewswire.com/news-release/2025/03/18/3044465/0/en/Sequel-Announces-First-CGM-Integration-for-its-twiist-AID-System-Abbott-s-FreeStyle-Libre-3-Plus-Sensor.html ↩ ↩2

What's next for this

  • →Tandem t:slim X2 + Libre 3 Plus integration rolling out internationally · through 2026
  • →Sequel twiist (Tidepool-powered) AID integration launching
  • →Dual glucose-and-ketone sensing in development for the Libre line

Sources

  1. [1]Accuracy of a 15-day Factory-Calibrated Continuous Glucose Monitoring System With Improved Sensor Design · peer-reviewed · 2025-04-04 — Alva et al., J Diabetes Sci Technol. Pivotal accuracy study covering the Libre 2 Plus and Libre 3 Plus sensors (PMID 40183340, DOI 10.1177/19322968251329364).
  2. [2]Comparison of Point Accuracy Between Two Widely Used Continuous Glucose Monitoring Systems · peer-reviewed · 2024-01-08 — Hanson, Kipnes & Tran, J Diabetes Sci Technol. Head-to-head Libre 3 vs Dexcom G7 (PMID 38189290, DOI 10.1177/19322968231225676).
  3. [3]Accuracy of continuous glucose monitoring during exercise-related hypoglycemia in individuals with type 1 diabetes · peer-reviewed · 2024-04-15 — Maytham et al., Front Endocrinol. Illustrates interstitial-lag and hypo-range accuracy issues common to current CGMs (PMID 38686202, DOI 10.3389/fendo.2024.1352829).
  4. [4]Abbott's FreeStyle Libre 3 Receives U.S. FDA Clearance — World's Smallest, Thinnest and Most Accurate 14-Day Glucose Sensor · manufacturer · 2022-05-31 — Abbott press release — form factor, minute-by-minute readings, sub-8% MARD, optional alarms, low relative cost.
  5. [5]FDA 510(k) K233537 — FreeStyle Libre 3 Continuous Glucose Monitoring System (age 2 and older) · regulatory · 2024-04-23 — FDA clearance document confirming the iCGM indication for persons age 2 and older.
  6. [6]Meet the FreeStyle Libre 3 Plus sensor · manufacturer — Abbott product page — 15-day wear, 60-minute warm-up, age 2+, factory calibration, water resistance, every-minute readings, compatible apps.
  7. [7]FreeStyle Libre 3 sensors will be phased out and replaced with FreeStyle Libre 3 Plus · news — Diabetes UK — confirms the Plus replaces the original Libre 3, with a UK phase-out by end of March 2026 and NHS availability.
  8. [8]FreeStyle Libre 3 and FreeStyle Libre 3 Plus · news — American Diabetes Association Consumer Guide — wear days, warm-up, age ranges, MARD, and pump compatibility (iLet, t:slim X2, twiist).
  9. [9]Sequel Announces First CGM Integration for its twiist AID System — Abbott's FreeStyle Libre 3 Plus Sensor · manufacturer · 2025-03-18 — Sequel Med Tech press release — Libre 3 Plus as the first CGM for the Tidepool-powered twiist AID system.
  10. [10]Beta Bionics Launches the iLet Bionic Pancreas With Abbott's FreeStyle Libre 3 Plus Sensor · manufacturer · 2024-10-30 — First U.S. insulin-delivery system to connect to the Libre 3 Plus; users can choose Libre 3 Plus or Dexcom.
  11. [11]t:slim X2 Insulin Pump Now Available With Abbott's FreeStyle Libre 3 Plus Sensor in the United States · manufacturer · 2025-10-29 — Tandem t:slim X2 with Control-IQ+ AID now integrates the Libre 3 Plus in the US; international rollout planned for 2026.