Female with positive urine protease but no symptoms

Urinary protein esterase refers to leukocyte esterase in urine. A positive test result may indicate the presence of a significant number of white blood cells in the urine, usually reflecting the body's response to infection or inflammation. In general, a positive urinary leukocyte esterase result in women without symptoms may be associated with drug reactions, urethritis, cystitis, chronic glomerulonephritis, endometriosis, or other causes, and targeted management is recommended. It is advised to seek timely medical evaluation and treatment at a hospital. Specific causes are as follows:

1. Drug reaction

Medications with immunomodulatory effects or those that may cause side effects in the urinary system can lead to increased white blood cells in urine. This does not necessarily indicate an active infection but may instead represent the body’s reaction to the medication.

2. Urethritis

Urethritis is inflammation of the urethra, typically caused by bacterial infection. The infection may trigger increased production of white blood cells as part of the body’s immune defense. Symptoms may include urgency, frequency, dysuria (painful urination), a burning sensation during urination, and sometimes discharge. Treatment may include medications such as azithromycin granules, cefixime granules, or roxithromycin tablets, as directed by a physician.

3. Cystitis

Cystitis is inflammation of the bladder caused by bacterial infection, which may lead to accumulation of white blood cells in the bladder wall and urine as part of the immune response. Typical symptoms include urinary urgency, frequency, lower abdominal pain, or hematuria (blood in urine). Treatment may involve medications such as minocycline hydrochloride capsules, amoxicillin tablets, or ampicillin capsules, based on medical advice.

4. Chronic glomerulonephritis

Chronic glomerulonephritis is a long-term inflammation affecting the kidney’s filtration system, potentially caused by various factors including autoimmune diseases. This inflammation may allow white blood cells to pass through damaged glomeruli into the urine, resulting in a positive leukocyte esterase test. Early-stage chronic glomerulonephritis may present no obvious symptoms; as the disease progresses, patients may develop proteinuria, hematuria, hypertension, or edema. Treatment under medical supervision may include furosemide injection, erythromycin tablets, or methylprednisolone tablets.

5. Endometriosis

Endometriosis is a condition in which endometrial tissue grows outside the uterus, potentially affecting the urinary system—such as the bladder or urethra—and causing localized inflammatory responses. This may allow white blood cells to enter the urine, leading to a positive leukocyte esterase result. Symptoms can be managed with medications such as danazol capsules, gestrinone capsules, or norethisterone tablets, as prescribed by a doctor.

In daily life, maintaining a light diet and avoiding spicy foods is recommended to support overall health.