Is urine tested for creatine levels?

Well, if the test is for Creatine, yes.

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Most drug tests check for creatinine level as a safeguard against diluted urinalyses. All machine tests do. Obviously you're looking for a low or nonexistent level of it to flunk the guy with, but let's say we find a REALLY high creatinine level. For preemployment screening they usually don't bother with a medical review officer, but all DOT and most other government employee tests are read by a medical review officer--a doctor trained to interpret urine tests. The doctor knows most of the people who take creatine are bodybuilders. If you walk in to your MRO session and the doctor sees you're a bodybuilder, you'll pass.