[Insanity]

At the risk of sounding stupid. Doesn’t this mean it would mask actual kidney disease? So you’d be ignoring potential warning signs.

[llm_nerd]

There is a much more accurate test called Cystatin C that can be used instead, and it isn't subject to being thrown off by creatine, muscle mass, etc.

[radley]

IF you tell your doc, they can adjust their interpretation of the test.

Edit: see comment below (i.e. better to stop taking creatine at least a week before a test).

[tensor]

If you have a good dr they'll just ask you to stop taking it for two weeks, then do a blood test.