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Real-World Accuracy of CGM in Inpatient Critical and Non-Critical Care Settings at a Safety Net Hospital 

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posted on 2023-08-10, 19:18 authored by Erin Finn, Lindsay Schlichting, Laura Grau, Ivor S. Douglas, Rocio I. Pereira

  

Objective:

We sought to determine real-world accuracy of inpatient continuous glucose monitoring (CGM) at multiple levels of acuity in a large safety-net hospital. 

Research Design and Methods:

We analyzed records from hospitalized patients on Dexcom G6 CGM including clinical, point of care (POC) and laboratory (Lab) glucose, and CGM data. POC/Lab values were matched to closest timed CGM value. Encounters were divided into Not Critically Ill (NCI) versus Critically Ill (CI). CGM accuracy was evaluated.

Results:

Paired readings (2,744 POC-CGM; 3,705 Lab-CGM) were analyzed for 233 patients/239 encounters (83 NCI, 156 CI). POC-CGM Aggregated and Average MARD were 15.1% and 17.1%. Lab-CGM Aggregated and Average MARD were 11.4% and 12.2%. Accuracy for POC-CGM and Lab-CGM was 96.5% and 99.1% in CEG zones A/B. 

Conclusions

Real-world accuracy of inpatient CGM is acceptable for NCI and CI patients. Further exploration of conditions associated with lower CGM accuracy in real-world settings is warranted. 

Funding

L.G. was supported by a collaboration between the Colorado School of Public Health Center for Innovative Design and Analysis (CIDA) and the University of Colorado School of Medicine Division of Endocrinology, Metabolism and Diabetes, I.D. was supported by NIH1RO1DK130351-01; R.P. is a Clinical Scholar supported by the Robert Wood Johnson Foundation (77887). No other financial support.

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