That looks to me like a mistake.
After 5 years it suddenly jumps 10x (or more, since it had been <.1).
That just doesn't make any sense.
Lab or doctor error. Look at a copy of the lab report yourself. It's possible whoever's reading the report is reading it wrong.
I feel your anxiety.
5 years clean and then this.
Good luck with the retest.
Let us know.