Interesting post,
@Zilsniggy . I think there was a similar thread about it recently but can't find it now.
From time to time, I've had situations where a batch just doesn't seem "right" but there's so many variables involved I've been unable to pin the blame squarely on the insulin.
However, I recently felt able to do so with a batch of Lantus. I know others have issues with Lantus but I'm ok with it. With this batch, though, it just didn't seem right from the start - I could clearly see on cgm a constant and pronounced rise starting after the last bolus ended. Played about with the dosage, changed vials, checked fridge temperature, wondered whether it was the aftemath of a cold I'd had for a week or so, xmas excess etc...
Then, in the course of a couple of days, it just went bat-sh*t crazy. On the Friday, ended up taking about 15 bolus shots to keep vaguely in line, then over Fri night Sat morning, this happened:
The green lines show bolus wearing out, accompanied by a savage rise above 10, then me taking 6u shots, brings it back down, only to rinse and repeat when that 6u wears off.
Headed straight round to the chemist on Sat morning to get an emergency prescription for a new batch. Used the same dose, and soon started getting nice straight lines like this overnight - see period between 2 and 9 am in lower graph:
Pretty clear evidence that it was a sketchy batch. Checked Argos but they don't do mass spectrometers! Chemist asked me to return what's left of the batch, so I'll see what comes of that.