I don’t know what happens in hospital labs, but from what happened to me, I’m sure they must have a klaxon first when anything is badly out of range
Because I had bloods taken for a completely different reason on a Wed, GP ringing me on Thursday tell me a haem appointment has been made for me Friday am at nearby teaching hospital.
It takes about 30 mins to run the actual test and labs seem to aim to do them the day received it or the next day if they come in late.
What takes the time is for all the right people to review/check results and send to whoever ordered the test.
But if you get leukaemic levels, then it doesn’t go into the routine queue / it’s straight to haematology do not pass go
I won’t dismiss your worries - the symptoms of leukaemia are very non specific. I hadn’t noticed I’d got it, but some signs were there (with benefits of hindsight)
But I’m sure that a worrying set of results will be reviewed and auctioned promptly. Do on that wholly unscientific basis, I think the more time that passes, the less likely a serious problem