First, I would guess that "I had my kidneys and liver checked prior to drug treatment" was via kidney and liver function blood tests. Repeat tests now might say the same, because early stage NA-FLD (steatosis) often doesn't have effect on function. So close monitoring is the right answer - my kidney & liver function were tested every 3 months the whole time I was on the Big 3, and for 6 months after I stopped. Now they are monitored every year, and the function remains normal.

I would also like to point out that radiology reports can be tricky.
I had a heart CT with contrast in September. My cardiologist's group has a "two read" protocol - each scan is read independently by two radiologists before it is returned to their office with the test findings. One radiologist interpreted the blockage in one artery as mild, and the other as moderate. The cardiologist agreed with the "moderate" interpretation, and used that protocol to treat me. They also differed on whether there was thickening of the wall in one chamber. He said these differences happen fairly often.