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

  

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.