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FreeStyle Libre 2 Plus

Abbott

What it is

Abbott's 15-day, factory-calibrated Libre 2 Plus: an optional-alarm CGM that streams every minute and drives select automated insulin delivery systems.

Editorial review: .

Source dates appear in the references where available; this record has no dated citation metadata.

Trial status, labels and access can change between reviews. How we review the evidence · How to read the evidence

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Available nowRegulator-approvedcgm

Evidence behind this assessment

Key evidence notes. Study results, product eligibility and access answer different questions.

Who was studied?
Study populations and analysis groups vary. Product age limits alone do not describe who was studied.
Benefit or performance
Accuracy: Overall MARD 8.2% in adults and 8.1% in children (6–17) vs YSI on the 15-day sensor; strong hypo-range performance (97–98% within 15 mg/dL). Slightly better than the original Libre 2's 9.2%.[1]
Important harms and treatment burden
Read the safety discussion and original sources. A missing summary does not establish safety.
Approval and country access
Country-specific approval and access are not summarized in this record.Approval, trial recruitment, local supply and funding are separate. Check the cited label or access source.
Follow-up and remaining uncertainty
Read the full discussion and original sources for follow-up duration and study limitations.

This record cites company or conference reports. Those sources may describe interim findings; their source type is shown in the source list.

Editorial score: calculation and evidence

A weighted editorial judgment on a 0–100 scale, not a probability of success or a measured treatment effect. Higher criterion scores mean more favorable assessments.

Default calculation: 82 × 20 + 66 × 15 + 68 × 15 + 85 × 10 + 90 × 10 + 70 × 10 + 70 × 10 + 0 × 5 + 82 × 5 = 7210; divide by total weight 100. Unrounded weighted result: 72.1.

Accuracy82

Overall MARD 8.2% in adults and 8.1% in children (6–17) vs YSI on the 15-day sensor; strong hypo-range performance (97–98% within 15 mg/dL). Slightly better than the original Libre 2's 9.2%.[1]

Low lag66

Interstitial lag is comparable to the previous sensor design; not a differentiator. Minute-by-minute updates are confirmed.[3]

Interoperability68

iCGM-classed and cleared to drive AID; integrates with Tandem t:slim X2 (Control-IQ) and Omnipod 5. DIY-loop use is indirect (bridge/xDrip+, EU models only).[4]

Sensor lifespan85

Up to 15-day wear — among the longest of any CGM, and one day longer than the Libre 2 it replaced.[2]

No calibration90

Factory-calibrated; no routine fingerstick calibration required.[1]

Alerts & prediction70

Optional, configurable high/low and urgent-low and signal-loss alarms. Alarms are opt-in rather than always-on; no built-in predictive-trend alerting like some rivals.[5]

Form factor70

Described as a round arm patch; larger than the Libre 3 / 3 Plus penny-sized sensor (about the size of 2 stacked pennies per IFU).[5]

Ketone sensing0

No ketone sensing on this model per its glucose-only labeling. Abbott's dual glucose-ketone sensor is built on the Libre 3 form factor and tracked separately.[6]

Access & cost82

Available in the US and UK, including via the NHS for those who meet NICE criteria. Out-of-pocket US cash cost without insurance is still meaningful.[7]

The full picture

The FreeStyle Libre 2 Plus is Abbott's 15-day successor to the original FreeStyle Libre 2. It is a small, factory-calibrated continuous glucose monitor (CGM): a round sensor described for wear on the back of the upper arm that sends a reading to your phone or reader every minute.5 A one-hour warm-up follows insertion, and no fingerstick calibration is needed during wear.5

Accuracy. In the pivotal study of the 15-day sensor (shared with the Libre 3 Plus), overall MARD — the average gap between sensor and lab glucose, where lower is better — was 8.2% in adults and 8.1% in children aged 6–17, with about 94% of readings within 20%/20 mg/dL of the lab reference.1 That is a modest improvement on the original Libre 2's ~9.2% MARD.8 Crucially for safety, it held up in the low range: 97–98% of results were within 15 mg/dL of the lab value during hypoglycemia.1 In the youngest children (2–5 years), accuracy was lower (11.2% MARD against fingerstick comparison).1

Alerts. Glucose alarms are optional and configurable — you can switch on high, low, urgent-low, and signal-loss alerts and set your own thresholds, or run without them.5 The fetched provider specs describe alarms that trigger at customized levels; no predictive-alarm claim was found there.

What it works with. The Libre 2 Plus is an "integrated CGM" (iCGM) cleared to drive automated insulin delivery (AID) systems.2 It powers the Tandem t:slim X2 with Control-IQ technology (integrated January 2024)3 and the tubeless Omnipod 5 (added November 2024 in the US).4 It runs from the single FreeStyle Libre app on supported phones.5 For DIY loops (AndroidAPS, etc.), there is no official support: data must be bridged through third-party apps such as xDrip+ or Juggluco, and direct connection works only with EU sensor models — a real limitation versus more loop-friendly sensors.9

Ketones. This sensor measures glucose only; it has no ketone sensing. Abbott is separately developing a dual glucose-ketone sensor, built on the smaller Libre 3 form factor — tracked elsewhere on this site.6

Who it's for. It is indicated for adults and children aged 2 and older, including in pregnancy.2

Access & cost. Available in the US and UK — in the UK it is available on the NHS to those who meet NICE criteria.10 Where paid out of pocket in the US, the roughly monthly supply of two sensors carries a meaningful cash cost without insurance.7

What's coming. The bigger leap is the dual glucose-ketone sensor in development: ketones being the early-warning signal for diabetic ketoacidosis.6 Expect future AID systems to fold that capability in.

What's next for this

  • →Abbott steering users toward the smaller Libre 3 line
  • →Dual glucose-ketone sensor in development (built on Libre 3 form factor, tracked separately)

Sources

  1. [1]
    Accuracy of a 15-day Factory-Calibrated Continuous Glucose Monitoring System With Improved Sensor Design · Peer-reviewed study — Alva S, Bhargava A, Bode B, et al. J Diabetes Sci Technol. 2025. doi:10.1177/19322968251329364 (PMID 40183340). Pivotal accuracy study of the sensor used in Libre 2 Plus and Libre 3 Plus.

    Alva S, Bhargava A, Bode B, et al. Accuracy of a 15-day Factory-Calibrated Continuous Glucose Monitoring System With Improved Sensor Design. J Diabetes Sci Technol (2025). doi:10.1177/19322968251329364 (PMID 40183340).

  2. [2]
    U.S. FDA Clears Abbott's FreeStyle Libre 2 and FreeStyle Libre 3 Sensors for Integration with Automated Insulin Delivery Systems · Manufacturer — iCGM clearance, 15-day modified sensors, age 2+, AID integration partners.

    Abbott. U.S. FDA Clears Abbott's FreeStyle Libre 2 and FreeStyle Libre 3 Sensors for Integration with Automated Insulin Delivery Systems (iCGM; 15-day modified sensors; age 2+; pregnancy). Abbott Newsroom (March 6, 2023).

  3. [3]
    Tandem's t:slim X2 Insulin Pump is the First AID System to Integrate with Abbott's New FreeStyle Libre 2 Plus Sensor · Manufacturer — Jan 2024 Tandem integration; minute updates; Control-IQ; 15-day wear.

    Abbott / Tandem Diabetes Care. Tandem's t:slim X2 Insulin Pump is the First AID System to Integrate with Abbott's New FreeStyle Libre 2 Plus Sensor (Control-IQ; minute updates; 15-day wear). Abbott Newsroom (January 8, 2024).

  4. [4]
    Insulet Adds FreeStyle Libre 2 Plus to Omnipod 5 Compatibility · Science journalism — Nov 21 2024 — Omnipod 5 tubeless AID compatibility in the US.

    Beyond Type 1. Insulet Adds FreeStyle Libre 2 Plus to Omnipod 5 Compatibility (US, November 21, 2024; SmartAdjust every 5 minutes). Beyond Type 1 (2024).

  5. [5]
    FreeStyle Libre 2 Plus Continuous Glucose Monitoring (provider specs) · Manufacturer — 15-day wear, 1-hour warm-up, minute updates, optional alarms, age 2+.

    Abbott. FreeStyle Libre 2 Plus — Continuous Glucose Monitoring (provider specifications: 15-day wear, 1-hour warm-up, minute updates, optional alarms, age 2+). FreeStyle Libre Providers (2025).

  6. [6]
    Abbott Announces Development of Novel Continuous Glucose-Ketone Monitoring System · Manufacturer — Dual glucose-ketone sensor in development.

    Abbott. Abbott Announces Development of Novel Continuous Glucose-Ketone Monitoring System (dual glucose-ketone sensor on Libre 3 form factor; minute readings). PR Newswire / Abbott (2022).

  7. [7]
    How much is a FreeStyle Libre 2 Sensor without insurance? · Science journalism — US cash pricing context for the uninsured.

    SingleCare. How much is a FreeStyle Libre 2 Sensor without insurance? (US cash-pay context for the uninsured). SingleCare (2024).

  8. [8]

    Abbott. FreeStyle Libre 2 System: Accuracy is Everything (accuracy context for the original Libre 2; see Alva paper). Abbott Newsroom. https://www.abbott.com/en-us/corpnewsroom/strategy-and-strength/freestyle-libre-2-system-accuracy-is-everything

  9. [9]

    AndroidAPS. FreeStyle Libre 2 and 2+ — Compatible CGMs (no native Bluetooth; bridge via xDrip+/OOP2/Juggluco; direct connection EU models only). AndroidAPS documentation (2024). https://androidaps.readthedocs.io/en/latest/CompatibleCgms/Libre2.html

  10. [10]

    Abbott. Cost & Coverage — FreeStyle Libre (UK NHS availability via NICE criteria). FreeStyle Libre UK (2025). https://www.freestyle.abbott/uk-en/getting-started/costandcoverage.html