Urine protein 3+ usually corresponds to 2.0~4.0g/L urine protein. However, the qualitative and quantitative results of urine protein may not exactly correspond to each other, and it is recommended to analyze the results together with the actual condition. Generally speaking, the qualitative and quantitative results of urine protein are as follows: negative urine protein (-) corresponds to <0.1g/L, weakly positive urine protein (±) corresponds to 0.1-0.2g/L, positive urine protein (+) corresponds to 0.2-1.0g/L, and urine protein (++) corresponds to 1.0-2.0g/L. Urine protein (++++) corresponded to 2.0~4.0g/L, and urine protein (++++) corresponded to >4.0g/L. Negative and positive urine proteins are qualitative tests and need to be detected using dry chemistry, etc. How many g/L of urine protein belongs to the quantitative test, which needs to be detected using immunoturbidimetric assay, etc. Qualitative and quantitative tests have different experimental methods and different sensitivities to various types of proteins, so the results of the two may not exactly correspond to each other, and the results should be analyzed in conjunction with the disease. If the patient found that the urine protein 3 +, it is recommended to go to the regular hospital in a timely manner, complete the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.