WHY BLOOD GLUCOSE WON'T ALWAYS MATCH SENSOR GLUCOSEWHY BLOOD GLUCOSE WON'T ALWAYS MATCH SENSOR GLUCOSE
WHY BLOOD GLUCOSE WON'T ALWAYS MATCH SENSOR GLUCOSEWHY BLOOD GLUCOSE WON'T ALWAYS MATCH SENSOR GLUCOSE

WHY BLOOD GLUCOSE WON'T ALWAYS MATCH SENSOR GLUCOSE

Here are a few important things for you to know about how your FreeStyle Libre sensor readings may differ from a finger prick blood test.

GLUCOSE vs INTERSTITIAL GLUCOSE

Finger prick blood glucose readings and sensor glucose reading won't always match and in fact are likely to be different. That's because sensor glucose readings come from the interstitial fluid (ISF), a thin layer of fluid that surrounds the cells of the tissues below your skin, not from your blood. There is a 5 to 10 minute delay in ISF glucose response to changes in blood glucose.4 Glucose readings on ISF have been proven to reliably reflect glucose levels.

SENSOR GLUCOSE VS BLOOD GLUCOSE

Finger prick blood glucose readings and sensor glucose reading won't always match and in fact are likely to be different.

That's because sensor glucose readings come from the interstitial fluid (ISF), a thin layer of fluid that surrounds the cells of the tissues below your skin, not from your blood.

There is a 5 to 10 minute delay in ISF glucose response to changes in blood glucose.1 Glucose readings on ISF have been proven to reliably reflect glucose levels.2

 

SENSOR GLUCOSE VS BLOOD GLUCOSESENSOR GLUCOSE VS BLOOD GLUCOSE

Glucose reading vs sensor reading

Here's a video tutorial to help show how blood glucose readings are different to sensor readings

1. Rebrin K, Sheppard NF Jr, Steil GM. Use of subcutaneous interstitial fluid glucose to estimate blood glucose: revisiting delay and Sensor offset. J Diabetes Sci Technol. 2010;4(5):1087-1098

2. Bailey T et al. The Performance and Usability of a Factory-Calibrated Flash Glucose Monitoring System. Diabetes Technol Ther. 2015;17(11):787-794.

What does ambulatory glucose monitoring mean?

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Is it accurate?

The FreeStyle Libre system is accurate, stable and consistent over 14 days [1] without the need for fingerprick calibrations.
To assess the accuracy of the FreeStyle Libre sensor, the glucose readings the sensor provides are compared to a known independent reference. In this case the reference is a finger prick blood glucose reading which is taken at the same time as the sensor scan. The comparison between the 2 different readings is plotted on a graph called a Consensus Error grid.

The closer the sensor reading to the reference blood glucose meter reading, the better the accuracy. This is reflected by the Consensus Error Grid by various areas on the graph labelled A to E. The higher the percentage of readings in Zones A and B, the more accurate the sensor is. The consensus Error Grid below shows 99.7% in Zone A and 99.0% in Zone B of the Consensus Error Grid [1].

1. Bailey et al. The Performance and Usability of a Factory-Calibrated Flash Glucose Monitoring System. Diabetes Technology & Therapeutics. Nov 2015; 17 (11).