re: How to interpret testosterone results? And what to do about it?

I just had my first ever testosterone test and sounds like it was the total version. I requested it from my GP even though they seemed to initially discourage it. They discouraged it primarily because I didn't have any symptoms of low T, basically I felt like I was as good of shape as ever at 40 years old. I just wanted a baseline for future reference, similar to how I now track cholesterol, blood pressure, etc.

My results unexpectedly were low, around 250ish. I read an article that claimed levels can vary quite a bit, even to the point that three different testers may come up with three wildly different numbers on the same sample. I also recall that I had a few nights without good sleep before getting tested. I want to eventually get it tested again, although not worrying about it too much yet. Also wondering if I've always had lower than normal levels. I don't get emotional about little things or have the stereotypical problems that can be associated with too high levels.