Hi Duckster,
Nice to meet you.
How are you? What symptoms are you having at the moment, and what treatment are you recieving?
How long blood tests take to come back depends on what was tested. A full blood count, U&E's and LFTs come back quickly - withing a few hours if they are sent by email or www (if your GP's office and local hospital lab communicate this way)
Antibody tests and compliment levels take longer in my experience - at least 2 weeks, but again this varies a lot between laboratories and also in how the results are communicated. If they have to be sent in the post this also adds to the time.
The best thing to do would be to ask your doctor what he/she estimates for your tests.
All the best,
X C X