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Comparative Accuracy Analysis of a Real-time and an Intermittent-Scanning Continuous Glucose Monitoring System.

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This study compared real-time (rt) continuous glucose monitoring (CGM) and intermittent-scanning (is) CGM systems. The Dexcom G5 Mobile (DG5) showed higher accuracy than the FreeStyle Libre (FL) when compared to laboratory results.

Keywords:
accuracycontinuous glucose monitoringmean absolute relative differenceperformancesensor

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Area of Science:

  • Diabetes Technology
  • Metabolic Monitoring
  • Clinical Diagnostics

Background:

  • Two continuous glucose monitoring (CGM) types exist: real-time (rtCGM) and intermittent-scanning (isCGM).
  • Understanding the comparative accuracy of these distinct CGM technologies is crucial for diabetes management.

Purpose of the Study:

  • To directly compare the accuracy of a specific rtCGM system (Dexcom G5 Mobile) and an isCGM system (FreeStyle Libre).
  • To evaluate device performance under controlled clinical conditions and during daily home use.

Main Methods:

  • Dexcom G5 Mobile (DG5) and FreeStyle Libre (FL) were worn concurrently by 27 participants for 14 days.
  • Accuracy was assessed against a laboratory comparison method (YSI 2300 STAT Plus) and blood glucose meters.
  • Key metrics included percentage of values within ±20% or ±20 mg/dL and Mean Absolute Relative Difference (MARD).
  • Consensus and continuous glucose error grid analyses were performed.

Main Results:

  • Both DG5 and FL demonstrated clinically acceptable accuracy.
  • DG5 achieved 91.5% of values within ±20%/20 mg/dL with a MARD of 9.5% against laboratory results.
  • FL achieved 82.5% of scanned values within ±20%/20 mg/dL with a MARD of 13.6% against laboratory results.
  • Both systems showed reduced performance during home monitoring and when using a blood glucose meter as reference.

Conclusions:

  • The DG5 rtCGM system generally exhibited superior agreement with the laboratory comparison method compared to the FL isCGM system.
  • These findings highlight differences in accuracy between distinct CGM technologies, impacting clinical decision-making.