Semiquantitative tests are used in some laboratories to confirm the presence of protein in the specimen when the result is positive on the urine dipstick. Tests that are used for confirmation include: sulfosalicylic acid (SSA); heat and acetic acid; nitric acid ring test; and Roberts' Ring Test. Any one of these procedures may be used for confirmation of the presence of protein. A protein dipstick result that is greater than a trace may be an indication of proteinuria.