Betty, be more proactive! If you live close to the hospital pick up a blood test form from the nurse. If not, you should have a GP practice nurse who can do the test and you should be able to get it done next day (after the weekend). There is nothing magical about the form. It just lists the specific tests needed, which the specialist nurse can tell you. If you're lucky you can book the test on line at the hospital bloodtaking dept, which saves the queuing. Alternatively, you can probably book it at your GP through a Patient Access app or similar, if you have enrolled via your GP practice. Quick as you need the results with the consultant by next Friday!
AC