Hi Merrin! I haven't met you yet and wanted to stop by and see how you're doing.
Looks like you worked through this morning's issue and decided to skip. Good call - Jack hasn't been on the Lantus long enough for you to be able to safely shoot him low and then leave. Jack looks like he's responding very well to his insulin. As you move forward, it's going to be helpful to you to understand how Lantus works. I see you're only on the 4th day of it and you're getting a bit of a baptism by fire!
Here's some information that explains a bit:
http://felinediabetes.com/FDMB/threads/sticky-lantus-levemir-what-is-the-insulin-depot.150/
And here's one more about how to take care of it so it lasts you as long as possible. It's expensive enough that most people want to be able to use it til the end:
http://felinediabetes.com/FDMB/threads/sticky-lantus-levemir-info-proper-handling-storage.151/
Because of Lantus' cumulative nature, ie, it builds up in the body over the first week or so of shots and the amount built up in the body is in equilibrium to the amount being slow-released, it works best if we can help you get to a dose that is the same every 12 hours or so without you having to skip. What you did this morning was fine - but it looks like he needs a smaller dose so that you can give it regularly for a while.
I would probably stick with the 0.5u for longer so we can see what he does on it. At the moment, I don't think we can know if 0.5u is too much or not because his dose has been recently reduced from 1.0u. The depot from the previous 1.0u dose could still be influencing his blood sugar this morning. Following the Rand/Roomp Tight Regulation Protocol, you would not decrease the dose unless you saw a test below 50 on a human glucometer.
If you want to reduce to 0.25u, you could. It's up to you.
The biggest change you can make right now is to always get at least one test in the pm cycle. We know from experience that many, many cats have their lowest numbers at night. Start with a test right before you head for bed so you know what he's getting to. Because Lantus dosing is based upon how LOW the dose gets a cat, knowing that # is really important.
I do want to suggest before you get farther into this that you use the FDMB world template for his blood sugar records instead of using an excel spreadsheet. The reason is because our "common language" here is using US numbers, not the mmol world numbers. There are some folks that are fluent in world numbers, but i'm afraid that you won't get the help you need if you are only using mmol. Using the FDMB world template allows you to enter the numbers in mmol and then there is an attached page that translates in US numbers for everyone else to see. That template is in the process of being updated by Marje and should be ready in the next few days.
You're off to a great start! Hang in there and it will get easier.
julie