I was never good at getting my blood levels taken but I believe I went toxic a couple of times, but that was because of symptoms. Besides the fact that I was in such a deep mental fog I couldn't even hold a conversation, I was also violently snaking, to the point that I couldn't write legibly, make my jewelry, or even do yoga because my Muscles shook so bad. So I am surprised you don't have any symptoms of it. But it's good your pdoc is on top of it.