I did inquire of my doctor if I should get the test in my recent physical last month. He told me that the tests aren’t sensitive enough to identify antibodies past about six months.
Yes, that is often the view of it.
T-cell could put this off your mind. Can prove to anyone that you had it or not, and maybe let you ease up on concern about getting it again. Which BTW, I don’t think is necessary to worry about unless you are a susceptible person.