Not moving...
I'm short 20 minutes of 2 hours without food, and a slight rise.
When can I go back to deaming?
You want the BG level to be going up, and preferable above 90 mg/dL, without any food for 2 hours. That way, by waiting the 2 hours with no food, you know the BG levels are higher because the effects of the food influence on the BG has worn off. I think that 88 was close enough to say "back to dreaming."
Same readings, same units given, but totally different outcome. Shouldn't I know within reason what's going to happen?
I know ill never be a 100% sure, but if 3U isn't safe, how the heck did I get away with the blue pmps and 2.25 units yesterday?!
Not every thing is under your control Sasha.
1. Because insulin is a hormone, it doesn't work exactly the same every single time.
2. The insulin you give one cycle, can have an effect for several cycles after that. Because you have chosen to use sliding scale dosing, you are going to see more wild swings in the BG levels from cycle to cycle.
3. Our cats get such tiny doses, it's very hard to accurately measure the dose consistently from one dose to the next. Your insulin syringes could be marked slightly differently on the barrel, within the same batch of syringes, and/or from batch to batch of syringes that you buy. So what looks like 2.25U could in truth be closer to 1.75U or even as much as 2.5 - 3U. I saw a thread that talked about a manufacturer that said the syringes could be as much as 1/2U different than what the markings on the barrel indicated. (So use calipers to measure the dose instead of only relying on the marked lines on the syringe.)
Take out a dozen syringes. Line them up exactly, with the barrels exactly lined up with each other. See how the markings, the lines on the barrel differ.
4.You don't have control over the activity level of Mauer. She's more active at different times of day, she's less active on some days. She and Miver play more, or sleep less or more during any particular cycle.
5. You don't control exactly how much protein, fat and carbohydrates are in the food you feed. The percentages are a generalization for a batch of food tested by the manufacturer. They make food in such large batches, they can't guarantee there is only a fixed percentage of any ingredient in the food, and it doesn't vary from batch to batch. That is why most foods give a minimum or maximum amount for a particular ingredient. It could be higher or lower than that amount.
The food is listed with "guaranteed analysis" figures. But those can vary a bit. For example, crude protein may be listed as 10% but perhaps it's 11% or 12% for a particular batch of food.That difference means the fat and carbohydrates will be different too for that batch.
Plus, manufacturers only have to provide that guaranteed analysis figures once, unless they make substantial changes to the food. Sometimes that analysis is done in a lab, sometimes the analysis is done with a very small group of cats for a very limited time period.
6. Maybe your cats digestive system is working slower or faster or processing the food better. No way to control what is happening with digestion.
7. Any other health condition, even something as basic as your cat trying to vomit up a hairball can make a difference. Or some slight constipation can slow the digestive system down and impact how much glucose gets into the bloodstream. Perhaps there is an unnoticed infection. Or the teeth and gums are inflamed, or who knows what else could be going on.
8. Prozinc tends to be a bit more volatile, in the swings of the BG levels. It's why so many people switch to a longer lasting insulin like Lantus or Levemir, for less volatility.
9. Bouncing. When Mauer drops low the evening cycle before, she shoots back up the next morning, to compensate. You are then giving her a large dose based on a high pre-shot AND the BOUNCE. Then she drops low again for the evening cycle. You're in a vicious loop, by mainly basing the shot on the pre-shot test and using that sliding scale.
What I'm saying is that there are simply too many variables with how food and insulin work. Most of those variables are not within your control.
In my opinion, the sliding scale dosing is not working well for Mauer.