Sparkysmom, I promised that I would look up basal testing for people that still have some insulin production. I couldn’t really find anything on it other than on one of the links that I am going to give you on basal testing, Gary Scheiner commented that someone producing some of their own insulin would need a lower rate than someone who is not. I would think that if he did not think someone producing some of their own insulin shouldn’t be doing basal testing, he would have said that. I looked in Using Insulin and John Walsh did not mention types at all in his discussion of basal testing.
The idea behind basal testing is that you should be able to take your basal insulin (for you, that is Lantus) and be able to skip meals and still have your BS stay fairly stable. Your BS should not go up or down by more than 30 points during the test period – if you start at 100, you should not go above 130 or below 70. John Walsh actually has a little bit tighter range than Gary Scheiner and John says not to go up more than 15 points – for his rules, you would not go above 115 or below 70.
You want to make sure fast acting insulin is out of your system – in your case, you don’t have any, but if you add some, that is good to remember in the future. You don’t want food digesting so you should wait about 4 hours after you eat before you start. You also don’t want to drink anything with caffeine in that can make your BS go up. You are basically stuck with water during the period of the test!
Both John & Gary say that the most important period is overnight. Depending on where my problem is, I start the test at different times. Since this would be your first time doing the test, I would follow the Lantus around the clock in 8 hour shifts. If you take your Lantus at 10 PM, start there. If you take it at 10 AM, then start there. You could do 8 hours one day, then pick up where you left off the next time.
If you go outside the ranges, then you would need to stop the test (especially if you have to treat the low!). Always give yourself a couple days in between any insulin adjustments before retesting.
For the overnight part, I usually set my alarm every hour, but I have heard some people say they will do even hours one night & odd hours another night.
The top 2 links were articles written by Gary Scheiner (Think Like a Pancreas). The bottom one is one that I wrote for my blog.
http://www.integrateddiabetes.com/p_basaltest.shtml
http://www.diatribe.us/issues/13/learning-curve.php
http://kellywpa.wordpress.com/2010/12/30/basal-testing/