Nutrition
CGM Sensor Basics
CGM sensor basics explain how continuous glucose monitors measure interstitial glucose, wear duration, application sites, and warm-up before trusting readings.
CGM sensor basics cover how a continuous glucose monitor sits under the skin measuring interstitial fluid glucose—not blood directly—with a wearable transmitter sending readings to a phone or receiver. Sensors last roughly seven to fifteen days depending on brand; application sites are usually the back of the arm or abdomen.
A warm-up period before trusting alerts is normal.
Common questions
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Does a CGM replace fingerstick checks?
Some systems reduce fingersticks, but calibration or confirmatory sticks may still be needed—follow your device instructions and clinician guidance.
Related terms
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