Thanks for the advice - I'll get the spreadsheet updated with the insulin information. Yes, I'm a newbie. Today is our 14th day of insulin (Lantus). We've only just begun getting a preshot reading consistently, and we'll use weekends to get more curve readings. My DH went home from work early today so he is going to try to get a 6 hour reading for today. (I won't be home until tonight.)
The day that I thought I gave her 4 units was the night that DH had to work late, so for the first time, I gave Stasia her injection myself. I thought the first shot was a fur shot, because her fur was wet, so I gave her a second shot. Judging by the significant decrease in her reading, I would say that I did get the first shot inside her, but with a few drops outside on her fur! So then we made the decision to go to 3 units - realizing she needed more than 2 units, but cautious not to jump all the way up to 4 yet. We wanted to test out 3 units for several days to see the pattern.
As for the 1/2 increments, the Lantus cartridge requires an OptiClick Pen, rather than a syringe to despense the insulin. (Not really knowing what I was doing three weeks ago, I chose to fill the insulin presecription with the cartridge rather than bottles because it was significantly less expensive.) As far as I can tell, it does not do 1/2 increments. But I'll double check. And I'll check out the Lantus support group, too, to learn more about. Great suggestion.