- A urine sample must be tested for proteinuria by dipstick method. Eligibility must be based on the most recent test result performed within 4 weeks prior to randomization. Urine dipstick must indicate 0-1+ protein and negative blood. If dipstick reading is greater than or equal to 1+ protein and greater than or equal to trace hematuria or greater than or equal to 2+ protein, a 24 hour urine specimen must be collected and must demonstrate less than or equal to 500 mg of protein.