Urine tests also cannot usually detect structural abnormalities in the kidneys, because there are many reasons for a positive test. For instance, standing for long periods, strenuous exercise or fever may all give rise to protein in the urine. Hence in most cases where a child has a positive initial test, the follow-up examination does not reveal any problem.
尿液篩檢，一般來說並無法發現腎臟結構的異常情況，因為尿液異常的原因很多，例如：有時候站太久、運動、發燒等都會引起蛋白尿，因此許多初次檢查有問題的學童，再作復檢時往往沒有問題。