Personal Case Study:
FreeStyle Libre 2 Study.pdf (178.1 KB)
From Abbotts website:
IMPORTANT: The device may inaccurately indicate hypoglycemia. The results of the clinical study conducted for this device showed that 40% of the time when the device indicated that user sensor glucose values were at or below 60 mg/dL, user glucose values were actually in the range of 81-160 mg/dL. Therefore, interpretation of the FreeStyle Libre Pro Flash Glucose Monitoring System readings should only be based on the trends and patterns analyzed through time using the reports available per the intended use.
I tried the Dexcom G5 in the past and got readings that were off by anywhere from 1 to 50 mg/dl. So, I stopped using it. I tried the Freestyle 1 (10 day) Libre and got similar results. I’m currently about 5 days into testing the Freestyle 2 (14 day) Libre. So far the readings are off by anywhere from 1-30 mg/dl. More accurate than the 10 day and G5. But, not accurate enough in my opinion for insulin dosing. I tested 5 times a day on an empty stomach before meals with the CGM and the FreeStyle Lite test strips.
I reviewed the details of several CGM studies. The methodology is to administer a bolus of glucose either orally or I.V. Then, measure glucose from the CGM and lab chemistry readings. This is all well and good. However, we don’t live in a laboratory under controlled conditions. We live in the real world where activity varies along with many other factors. It would be interesting to see others’ real-life experiences with CGM.
Update: 11/21/19 - FreeStyle Libre 2 vs finger Stick Study attached in pdf format.