The Difference Between Sensor Glucose And Blood Glucose

Finger prick blood glucose readings and sensor glucose readings 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 tissues below the skin, not from blood.


Why Are FreeStyle Libre Sensor Readings Sometimes Different From A Finger Prick Blood Glucose Test?



Blood glucose and sensor glucose are closely related but not identical.  


  • A sensor glucose reading always lags behind a finger prick blood glucose reading by about 2.4 img 4.6 minutes. 


  •  If glucose levels are rising or falling, then the two readings may be different. This is completely normal and to be expected, particularly after meals, after taking insulin or when you´ve been exercising. 

  • When your glucose levels are stable then the two readings may be very similar. 

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