Dexcom sensor has been on for a couple of days, right on for 36 hours. The track is solid and steady all afternoon, towards the top of the range. No sports, no special activities.
Late afternoon, my son tests once, gets 213. He washes and dries his hands carefully, tests again, gets 215 (CGM still rock steady around 120). So he doses heavily with a pen (5 units), then tells me what happened and asks for my advice on calibrating: should he? I am puzzled. Meter problem? I tell him not to calibrate, and to test again in 10 minutes to see what happens, as I suspect a true peak going up and down very quickly, but not showing up on the CGM.
My son tests 15 minutes later: it is now 143. A few minutes later, it is back to within 5 of CGM, a CGM that is very steady around 120.
But now we have 5 units of insulin. No big deal, time for dinner anyway. We make dinner to match 4 units of insulin (using the extra unit to come back to the center of the range), and wait for the 45 minute mark when he should turn the corner. We wait, wait, wait. 40 minutes after he should have turned the corner (1 hour 25 minutes after injection) he starts going up a bit and we stack 4 more units. Five minutes later, he turns the corner
Sometimes you really wonder what is going on! Do you have any thoughts on understanding this sequence?
Btw, when my son calibrated in the evening, the CGM was still right on.