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Table 1—

Specifications of available and likely soon-to-be-available products for continuous glucose monitoring

ProductFDA approvedCE markedYear first approved or markedSensor typeSensor mechanismSensor locationSensor warmup (h)Calibrations per lifetime of sensorSensor lifespan (h)Frequency of testing (min)Time of blood glucose data displayAlarm
Continuous Glucose Monitoring System Gold Yes Yes 1999 Minimally invasive Enzyme-tipped catheter Subcutaneous abdomen 12 72 Retrospective No 
GlucoWatch G2 Biographer Yes Yes 2001 Minimally invasive Reverse iontophoresis External on arm or forearm 13 10 Real time Yes 
Guardian Telemetered Glucose Monitoring System Yes Yes 2004 Minimally invasive Enzyme-tipped catheter Subcutaneous arm 12 72 Retrospective Yes 
GlucoDay No Yes 2001 Minimally invasive Microdialysis Subcutaneous abdomen 48 Real time or retrospective Yes 
Pendra No Yes 2004 Noninvasive Impedance spectroscopy External on wrist 20 3 months Real time Yes 
FreeStyle Navigator Continuous Glucose Monitor No No — Minimally invasive Enzyme-tipped catheter Subcutaneous arm 72 Real time Yes 
ProductFDA approvedCE markedYear first approved or markedSensor typeSensor mechanismSensor locationSensor warmup (h)Calibrations per lifetime of sensorSensor lifespan (h)Frequency of testing (min)Time of blood glucose data displayAlarm
Continuous Glucose Monitoring System Gold Yes Yes 1999 Minimally invasive Enzyme-tipped catheter Subcutaneous abdomen 12 72 Retrospective No 
GlucoWatch G2 Biographer Yes Yes 2001 Minimally invasive Reverse iontophoresis External on arm or forearm 13 10 Real time Yes 
Guardian Telemetered Glucose Monitoring System Yes Yes 2004 Minimally invasive Enzyme-tipped catheter Subcutaneous arm 12 72 Retrospective Yes 
GlucoDay No Yes 2001 Minimally invasive Microdialysis Subcutaneous abdomen 48 Real time or retrospective Yes 
Pendra No Yes 2004 Noninvasive Impedance spectroscopy External on wrist 20 3 months Real time Yes 
FreeStyle Navigator Continuous Glucose Monitor No No — Minimally invasive Enzyme-tipped catheter Subcutaneous arm 72 Real time Yes 
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