For what it's worth, I read an abstract (I think it was on this site) that said the statistics were:
Cystoscope finding recurrence: 80%
Cystoscope + nmp22 finding recurrence: 90%
But I don't think anyone would do a urine test without a cystoscope? That's still the gold standard.
Unfortunatly my doc. doesn't do them (nmp22).