I'd also like to add some additional information perhaps, for clarification. While there are other approaches and methods available out there (internet, etc), we have two dosing methods that we follow here on the forum. I believe the information was linked in a previous post, but I will attach it again for you here:
Dosing Methods: Start Low, Go Slow and Tight Regulation (TR) (<-click to open the info page)
Much of how we approach dosing is tied to understanding how low the dose is taking the kitty, and making adjustments based on the test data that we see. In order to do that, it is important to get a sense of how your own cat responds to insulin, and the carbohydrates from their food; no two cats respond exactly the same way. How my cat reacts to insulin and carbs may be completely different than how your cat responds. That is why we often say "know thy cat".
You can do this by learning how YOUR kitty is responding to insulin:
- Onset - the length of time before insulin reaches the bloodstream & begins lowering blood glucose
- Peak/Nadir - the lowest point in the cycle
- Duration - the length of time insulin continues to lower blood glucose
- How to do a Curve - a simple explanation
I think it was mentioned in a previous post to try and get some tests at different times each cycle, and fill in some gaps where you don't normally test. So perhaps today, now that you have increased, you might try and get a +2 and then test again around +4 or +5. Then for this evening, along with your preshot test, maybe check him at +2 and then see if you can catch a test somewhere around +8 or +9, since he seemed to have shown some lower numbers in the evenings when he was at the vet's office. Then maybe tomorrow mix it up a little, perhaps try a test at +3 and +7 in the morning cycle, and so on. What you are trying to do is get a feel for how he is responding to the insulin, by testing at different times.
With Lantus, we often like the +2 because it can sometimes be a good indication of how the cycle will go. If the +2 is higher than preshot, it usually indicates that not much movement will occur in the blood glucose levels. If the +2 is the same and certainly significantly lower, then that could signal more testing is required as the numbers may drop a little more quickly. By taking additional tests, that will allow you to monitor and feed to help slow down the drop.
Hope this helps, please do ask any questions you may have, we are happy to try and help you along in this process.
Buena suerte