Is MRSA cultured in urine a contaminant?

More info needed. Why was the culture done? was the person having any symptoms? Answer to your question will depend on whether or not the person was having urinary or systemic complain. MRSA in urine could be significant, or a contaminant depending on the clinical presentation.
Depends. If the urine collection process was contaminated then cld be a contaminate. If done correctly and no foley cather in place then probably not a contaminate.