I was tested last month. It came back a 3. The test before that was a 4 (2 yrs ago). I just asked the Doc to add it to all the other blood tests he was doing. Told him (new Doc) I have it done every 2-3 years to keep a baseline since I handle lead a good bit. He said it was a good idea. Since I have type 2 diabetes I get blood drawn every couple months so it's no biggie to throw that test in.