Last year for the first time on my blood work they checked my CPK levels(creatine kinase) every thing else was about normal,The doctor said high levels over work your Kidneys,She said this is high levels of protein in the blood,so I cut back on the shakes,but while i still lift with out a break for days it is still running high,so I didn't lift for three days but still consumed a moderate amount of protein and it did drop down,But the endocrinologist I went to said if you are lifting you are going to have high levels,but that high levels are not good for the kidneys,nobody has told me what to do to keep the level down other than don't lift for days,but i don't want to quit for that long every week,I drink a lot of coffee is my liver busy working on removing other things,I thought the kidneys removed the protein,endocriologist said give yourself a long break and drink a lot of water,HAS ANYONE ELSE DEALT WITH THIS PROBLEM BEFORE.Stats? How much protein? What is your basic lifting routine? They've confirmed you did not have a heart attack? Why was the test ordered in the first place?