[cperciva]

I've found that the interstitial delay is pretty minimal; maybe 5-10 minutes behind fingerpricks (which themselves lag somewhat behind arterial blood, especially if your hands are cold). The dominating factor is the 15-20 minutes it takes before the median of a window reflects the new data.

[shanselman]

Sure, but we agree every minute counts. Also, CGMs in arms differ from belly, etc. 10 min when insulin starts in 30 is a non-trivial amount of time. Point is, we def need faster insulin and faster, more accurate CGMs.