I have just posted a question on the PA site but just in case I do not get any replies I am asking here as well.
I am having my blood taken tomorrow for an Active B12 test to send to St. Thomas.
Does anyone know if it is better to fast for 12 hours before the test? and Do I just post the sample after the nurse has taken it or does she need to freeze it first. I have read and reread the info sheet but I am confused about the correct procedure for posting.