False proteinuria is a condition in which there is no protein in the urine itself, but rather other causes of protein in the urine, which is mistakenly thought to be present. The common cause of false proteinuria is that the urine is mixed with vaginal secretions, semen, lymphatic fluid, prostate fluid and other substances that contain proteinuria, and a false-positive reaction occurs when the urine is mixed and then tested for urinary protein. With the retention of urine specimens also have a certain relationship, the operation is not qualified, the urine is contaminated will lead to false proteinuria. Proteinuria test need to retain early morning clean urine, the possibility of contamination is minimized, the anterior part of the urine can be excreted to flush out the secretion of the urethra, so as not to affect the results of the test. The urine specimen should be analyzed as soon as possible, leaving it for too long will affect the results and lead to the occurrence of pseudo-proteinuria.