Well I have a question to put out there for anyone who recently had a ct scan. I got the drink to take for the usual period. I was then called in for the scan but asked about my kidney function test. This was new to me! So they went on my last test in October as at present I am on a drug free holiday. But it seems now you need this blood test done before your ct scan. Have any of you come across this yet. I have appt for result in ten days time so I will ask then but I am just curious.