Interesting. The likes of Superdrug were doing them once then they stopped. That's what we should have. It could save on vaccine doses too.
An anti-body kit or antigen?
Isn't antigen the one that tells you if it's in your system at that time (or within a week or two?).
I know the anti-body test I did had two factors to it ('M' and 'G').
You could test negative for both (I did), or positive for one, negative for the other, or positive for both of them. One of them meant that you currently had the type of antibodies which suggested that you'd had COVID within the last month, and then the other was if you had the antibodies which would last in your system longer (3-6 months IIRC).
The one that
@COYBL25's wife gets may well be more advanced, now.