Urine culture

How accurate is a urine culture? I posted a few days ago about the doctor finding blood & white blood cells in my urine. I called back today to see if they had the test results in, and she said everything came back negative. So, no UTI, no kidney infection, nothing! (Yay!! 🤗)

Never had any symptoms or anything, but there's no way a urine culture could be wrong, right?

I'm going to call tomorrow to see why another reason would be to have blood & white blood cells in my urine.