Nutrition
Interstitial Fluid Glucose Lag
Interstitial fluid glucose lag explains why CGM readings trail blood glucose during fast changes—context before reacting to every alert.
Interstitial fluid glucose lag is the delay—often roughly five to fifteen minutes—between blood glucose and the glucose a continuous glucose monitor reads in fluid under the skin. Fast rises or falls can look late on the app, especially during exercise or after rapid carb hits.
Confirm urgent lows per device instructions and clinician guidance.
Common questions
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Why does my CGM spike after I already feel low?
Lag and sensor smoothing can desync feelings from displayed numbers during rapid changes. Follow your clinician's hypo treatment plan and device confirmatory rules.
Related terms
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