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Why would I have an elevated creatinine (.45 mg/dL) and a normal BUN (17 mg/dL)?

I have been on statins for over 20 years if that makes a difference.  I also do a low carb diet which has resulted in my losing about 1/3 of the weight I need to lose.  I am especially interested as I am feeling supremely fatigued (though COVID stay at home has definitely hurt my activity levels too).  Is there anything else specific I should be looking at?
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My wife just went through a similar experience, and the doctor sighed.  He said he wished they wouldn't warn people about this as much as they do.  That being said, a low carb diet might mean you are eating way too much protein, or it could mean you just eat somewhat more protein.  Eating too much protein can cause kidney problems.  Statins, as far as I know and I'm not an expert, are more of a problem for the liver and the joints.  Talk to your doc, but if when you got the test the doc didn't call you in for further investigation it meant most likely the doc didn't see any real problem.  I'm not sure why covid has limited your activities unless you live in a country that imposed severe quarantine, as although we don't do all the things we used to do we have more time for exercise because we're not doing those things.  But do know that low carb diets are not correlated with health, although they can be effective in a short period of time with short-term weight loss.  They can be dangerous, as protein isn't our energy food, carbs are.  
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It's my understanding that BUN will usually RISE if someone is eating too much protein.  Urea nitrogen is a normal waste product in your blood that comes from the breakdown of protein from the foods you eat and from your body metabolism. It is normally removed from your blood by your kidneys, but when kidney function slows down, the BUN level rises. BUN can also rise if you eat more protein, and it can fall if you eat less protein. So, perhaps he has kidney disease but am not sure protein is involved in this situation.  
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