How seriously should we take haematuria?

Résumé

Please forgive the folly of the question in the title. It is a question I have been puzzling over during some recent work at Nottingham University Hospital in the UK. The hospital seems overwhelmed by often asymptomatic members of the public who have dipstixpositive haematuria. Whether they be 19 or 99 years, they all get a scope and a scan.