Question Author
Thanks everyone for all your advice and comments. It looks, from your replies, as if the test is routine for liver and kidney function, wish they could have told me in the first place. I did ask reception to ask the doctor what it was for and they rang back to say it was 'to be on the safe side' (whatever that means! Perhaps they didn't understand/listen to my query). Anyway the blood test is later today so will ask, again, what it is for. Once again, thanks to you all.