If your idea of stable consists of maintaining a set number such as 2.5, no and you'll never find it either. From test to test you can fluctuate up to .5 between tests. Now if you consider stable staying in your prescribed range, say 2.5 to 3.5, yes. In order to be stable, you need a person managing you that knows what they are doing and unfortunately, too many do not, which is why so many of us manage ourselves.
What are you encountering? Can you give us your dose specifics, how often tested, what your diet is like, any other meds, etc.?