At age 72, a female who rides a bike 15-20+ miles 3-4 times a week with well developed muscles and was shocked when my cardiologist phoned, after seeing him for my annual checkup, and told me that my creatine levels were high and I needed to have an MRI done of my kidneys. What can I do to lower the level of creatine in my blood. I do have several cardio issues and have taken meds for hypertension since I was 50. I think I am unusually healthy and active; we eat no processed foods and limit red meat.