For the sake of pedantic clarity: much as I like saying that, I don't actually have scurvy -- quite.
I do presently have plasma vitamin C levels which (Google tells me) would qualify me for a scurvy diagnosis if I was showing any particular symptoms. Which I'm not, beyond my usual levels of fatigue and physical crud (there's stuff -- flare-up of an old injury, etc. -- which, with hindsight I could construe as maybe related somehow, but basically I'm very well, and said stuff would not have made me suspect that anything was wrong). Possibly I'd get symptoms if I let the deficiency run on longer, but that's an experiment I am disinclined to try.
N.B.: this is on an intake of fruit and veg which should easily supply far more than the RDA from diet alone, plus supplementation of a gramme of vitamin C a day.
Which is absurd mega-dose levels.
It used to be two grammes, as that's what it took to drag my blood levels back into the normal range when this showed up on test results before; this past year I suggested tapering down to half-as-ridiculous and monitoring my blood levels to see if they stayed okay. Which they did, at least until last autumn.
Then I was getting a blood test for something else completely, my GP suggested checking my vitamin C levels, and boom, they have fallen through the floor again.
So now, back to double-ridiculous doses and waiting to re-test.
My medical Google-fu is usually pretty good, but it's failed me so far on this. I've asked my doctor to consult colleagues and see if I should be referred to a relevant consultant or WTF, on the basis that it's such a bizarre and extreme test result we should probably see if there's an underlying reason that could or should be treated (or, for example, something which might cause the test to give inaccurate results).
Anyway, I thought I'd lob it to the hive mind in case anyone's heard of a similar case or know of something that could cause this, because I am so baffled. And I realize that my belief that bizarre medical things should happen because of reasons has been shown to be delusional before, but still.
... maybe I have a tapeworm that consumes nothing but vitamin C.