“Mixed erythrocytes” are found in hematuria. “Mixed erythrocyte hematuria” refers to the presence of red blood cells of different morphology and structure in the urine, which can be categorized into glomerulonephritic and non-glomerulonephritic hematuria depending on the source of the disease. According to the morphology of red blood cells in urine, hematuria can be divided into three categories: homogeneous erythrocytic hematuria, non-homogeneous erythrocytic hematuria, and mixed erythrocytic hematuria. Mixed erythrocytic hematuria contains normal red blood cells and red blood cells with abnormal morphology, and can be divided into glomerulonephritic hematuria (non-homogeneous erythrocytic hematuria), and non-glomerulonephritic hematuria (homogeneous erythrocytic hematuria). 1. Hematuria of glomerular origin: Due to the extrusion of red blood cells when passing through the glomerular filtration membrane, the morphology changes, resulting in the appearance of a variety of malformed red blood cells. If the destruction of the glomerular filtration membrane is severe, there may be normal red blood cells in the urine. Commonly found in acute and chronic glomerulonephritis, IgA nephropathy, systemic lupus erythematosus nephritis, tubular necrosis and so on. 2. Non-glomerular hematuria: due to the breakage of urinary tract mucosa, red blood cells are stimulated by urinary stones, tumors, inflammation and other stimuli caused by red blood cell morphology changes, appearing mixed red blood cell hematuria. Commonly found in urinary tract infection, urinary tract stones, bladder cancer and other diseases. Mixed erythrocyte hematuria has many causes, hematuria should be further diagnosed in local hospitals to clarify the cause of the disease and receive treatment under the guidance of physicians.