Just Had An Afp Test. It Is 6.5. Study Said

Just had an afp test. It is 6.5. Study said higher than 6.1 is a concern. Going for ct scan. I have been diagnosed 2 years ago with cirrhosis from fatty liver. My liver is a 9 on the liver scale according to my dr. I am age 50. The dr before said I might need a liver transplant in 20 plus years. My concern is how accurate is this test for cancer? Can it be affected by other conditions like diabetes causing it to increase? I am also having problem with a kidney stone at this time, could it affect this test?