No antibodies one month after 1st AZ vaccine

[GenderApostate19]

DH is part of the Biobank study and had an antibody test kit yesterday (fingerprick) it came up as negative - I would have thought that only a month after vaccination, it would have been positive?

They make it very clear in the info about the biobank test not to worry if you receive a negative anti body test. Apparently you are only likely to get a positive antibody result using that test if you have actually had Covid

I had no antibodies after my first test (admittedly it was only 2 weeks post vaccine, so not expected). I was SO looking forward to my results four weeks later (I have an autoimmune condition, so it felt really important).
And the bloody lab seems to have LOST/DROPPED/RUINED my test, so no result at all.
Very disappointed. I have to wait for the next one, but have lost so much confidence in the process. (ONS Study)