What exactly does blood & protein in urine mean when kidney test says normal?

Blood and protein: Blood (b) in your urine( u) is an abnormal finding. Protein (p) in your urine is abnormal when it is > 80 mg/day. Your lab work may be normal when b and p first appear in your u. Do a 24 hour urine for creatinine clearance and protein and have a renal ultrasound (us). If the us doesn't show any bleeding site, have cystoscopy. If you have > 1 gram of protein/day, you may need a kidney biopsy.