The US is going to screen donated blood for the presence of anticovid antibodies, hoping to extrapolate the prevalence from this.
No plans for this in the UK
from what I checked earlier. They're certain that COVID itself does not transmit in blood (is what that page currently says), and they have no mention of the usage - described elsewhere - of recovered persons' bloods being apparently beneficial to (some?) current sufferers. Perhaps effectively an antigen/antibody 'serum' effect.
I originally looked this up a couple of weeks ago as it's about now I would expect my regular "time to make an appointment" SMS. Though as it's neither xmas nor summer, it's probably not going to say "at this time of year our stocks are low" - there may be a depressed number of donors, but a large number of elective surgeries will also be delayed that might have absorbed stocks a bit.
I really would like to donate (something like my 97th or 98th time, IIRC) before I start to detect my hay-fever 'tingle'. In past years I might have just made sure I'm not sneezing on the day (ok, so not
quite as blasé, but YGTI) whereas this time round it's always possible the overlapping symptoms could be this (still) rather more unknown issue.
I'm far from likely to be routinely tested (antigen/antibody), assuming I don't obviously succumb along the way, until they decide to scale up to the capacity to mass-screen whole swathes of the population. It'd be nice to get such reassurance/confirmation out of the way but I'm rather resigned to being in the dark for the foreseeable.
(While I'm in here again correcting a trivial typo, let me also wish the
continuing best for yor wife, Dun. Aside from being probably-not-COVIDiated, right this moment, it sounds like there's at the very least a potential for even more stress than her job would normally give. Even if there's no later exposure in her immediate future, I can't imagine the work-hours will become any more sane this side of a big change in the workplace.)