Sensor accuracy was not affected by factors such as body mass index, age, type of diabetes, clinical site, insulin administration, or hemoglobin A1c.Ĭonclusions: Interstitial glucose measurements with the FreeStyle Libre system were found to be accurate compared with capillary BG reference values, with accuracy remaining stable over 14 days of wear and unaffected by patient characteristics.Ĭ apillary and venous blood glucose (BG) values are typically used as reference to evaluate the accuracy of in vivo sensor devices. The mean lag time between sensor and YSI reference values was 4.5±4.8 min. The overall mean absolute relative difference was 11.4%. The percentage of readings within Consensus Error Grid Zone A on Days 2, 7, and 14 was 88.4%, 89.2%, and 85.2%, respectively.
Results: The accuracy of the results was demonstrated against capillary BG reference values, with 86.7% of sensor results within Consensus Error Grid Zone A. Sensor readings were masked to the participants. Sensor glucose measurements were compared with capillary blood glucose (BG) results (approximately eight per day) obtained using the BG meter built into the reader (BG reference) and with the YSI analyzer (Yellow Springs Instrument, Yellow Springs, OH) reference tests at three clinic visits (32 samples per visit). Three factory-only calibrated sensor lots were used in the study. A sensor was inserted on the back of each upper arm for up to 14 days. Materials and Methods: Seventy-two study participants with type 1 or type 2 diabetes were enrolled by four U.S. Adults will usually be offered a choice of CGM or flash.Īsk your diabetes team about getting CGM or flash glucose monitoring.Introduction: The purpose of the study was to evaluate the performance and usability of the FreeStyle ® Libre™ Flash glucose monitoring system (Abbott Diabetes Care, Alameda, CA) for interstitial glucose results compared with capillary blood glucose results. Getting CGM or flash on the NHSĬGM or flash glucose monitoring should be available on the NHS to anyone with type 1 diabetes.Ĭhildren and young people will usually be offered CGM. To get the best out of CGM or flash, you'll need to look at the information it gives you with your team. This means you'll still need to do finger-prick checks every now and then, particularly when you drive or have a hypo. Interstitial fluid glucose readings are a few minutes behind your blood glucose levels. You generally need to replace a sensor every 7 to 14 days, depending on the type of monitor you have. The Abbott FreeStyle Libre 2 also has an alarm, but it only sounds when you scan the sensor. Some types of CGM have optional alarms to alert you if your blood glucose levels go too low or too high. The only types of flash monitor available are the Abbott FreeStyle Libre and FreeStyle Libre 2. There are several different types of CGM. With flash, you need to scan the sensor with the reader or with your phone to see the results. Some types can send results to an insulin pump, so you can see your glucose levels on your pump. You can see your glucose levels on your receiver at any time. With CGM, the sensor sends results to the receiver or your phone every few minutes. a reader or receiver, which shows the results (you can also get the results on your smartphone, if you have one).a sensor – a small device you attach to your arm or tummy that senses how much glucose is in the fluid under your skin, called interstitial fluid.low – it could be a sign of hypoglycaemia.high – it could be a sign of hyperglycaemia.what happens to your levels when you're asleep.how your glucose levels change over time.if your glucose levels are going up or down.It can help you and your diabetes team see: It can help you control your blood glucose levels, as you'll have more information and can take action quickly. It lets you see patterns in your levels and check if your glucose is too high or low. You can check your sugar (glucose) levels at any time with a continuous glucose monitor (CGM) or flash monitor.