Urinary occult blood (++) in women: The first, if it is menstrual period can lead to contamination of the specimen, resulting in urine that may be mixed with red blood cells resulting in urinary occult blood (++). The second, urinary system-related diseases, commonly glomerulonephritis, such patients may have urine protein in addition to urine occult blood, and even combined with hypertension, edema, and common causes such as urinary tract infections can cause urine occult blood (++), often combined with positive urine leukocytes, the patient will appear frequent, urgent, painful urination. The third common cause, such as tumors of the urinary tract, can also cause urinary occult blood (+++). In addition, systemic diseases can also cause urinary occult blood (++) in women, such as allergic purpura nephritis, or systemic lupus erythematosus nephritis, as well as thrombocytopenic purpura can cause urinary occult blood (++).