Leukocyte Esterase in Urine - Understanding Test Results & Causes
Leukocyte esterase in urine is an enzyme released by white blood cells. In short, a positive leukocyte in urine means there maybe an inflammation or an infection in the urinary tract.
Although it is commonly associated with urinary tract infections (UTIs), it can also result from kidney infections or bladder inflammation. However, since the leukocyte esterase urine test doesn't confirm a diagnosis, doctors often combine it with a urine culture or microscopic examination.
Thus, if you are wondering what is the meaning of leukocyte esterase, explore its symptoms, causes, and diagnostic methods to seek timely treatment and protect your urinary health.
What are the Symptoms of Leukocyte Esterase in Urine?
A positive leukocyte esterase in urine often results in some common signs, including:
- Burning Sensation While Urinating: Pain or discomfort during urination is one of the earliest symptoms.
- Frequent Urge to Urinate: The patients can feel the need to urinate more often, even when little urine is passed.
- Cloudy or Foul-Smelling Urine: Those who have leukocytes in urine may see it as cloudy, milky, or have a strong, unpleasant odour.
- Pain in the Pelvic Area: Discomfort or pressure around the bladder is common in this condition.
- Blood in the Urine: Also known as haematuria, in such situations, the urine may appear pink, red, or brown due to the presence of blood. The presence of leukocytes and blood in urine may indicate a urinary tract infection, kidney stone, or another urinary condition.
- Fever and Chills: A fever, often accompanied by chills, can be a sign of a more serious kidney infection, causing leukocyte esterase.
- Difficulty or Pain During Urination: While passing urine, individuals with leukocyte esterase may feel strained or in pain.
- Fatigue: The body's immune response to infection can cause tiredness and low energy.
What are the Causes of Leukocytes in Urine?
The rise of white blood cell leukocytes in urine can generally occur from various reasons, such as UTI, kidney infection, and autoimmune disorders. Read on to learn about it in detail.
1. Urinary Tract Infection (UTI)
The most common cause of leukocyte esterase in urine is a urinary tract infection. When bacteria enter the urinary tract, the body's immune system responds by sending white blood cells to fight the infection. Especially with 25%–30% of women experiencing recurrent UTIs, as per the report of The Times Entertainment, this condition can also be common.
2. Kidney Infection (Pyelonephritis)
A kidney infection is a more serious form of UTI that can affect both of your kidneys. As a result, it often causes a high leukocyte count in the urine. In fact, along with this condition, it may also result in fever, chills, back pain, nausea, and vomiting.
3. Bladder Inflammation (Cystitis)
Whether caused by bacteria or other irritants, inflammation of the bladder can increase white blood cells in the urine. In this situation, it is common to experience painful urination, pelvic discomfort, and frequent urges to urinate.
4. Sexually Transmitted Infections (STIs)
Certain sexually transmitted infections, such as chlamydia and gonorrhoea, can lead to inflammation in the urinary tract. This may result in a positive leukocyte esterase urine test even when standard urine cultures do not detect bacteria.
5. Autoimmune Disorders
Individuals with autoimmune conditions such as lupus can experience inflammation in their kidneys and urinary tract. Thus, the resulting immune response increases the number of white blood cells found in urine.
6. Recent Urinary Procedures
Medical procedures involving the urinary tract, such as catheter insertion or cystoscopy, may temporarily irritate the tissues and increase white blood cells in the urine.
7. Interstitial Nephritis
Under this condition, the spaces between the kidney tubules become swollen or inflamed. Therefore, it can result in a positive leukocyte esterase in urine tests without a typical bacterial infection.
8. Certain Medications
Some antibiotics, like penicillin, NSAID painkillers, and other medications, can cause kidney inflammation. Therefore, it leads to the presence of leukocyte esterase in urine.
How to Trace Leukocytes in Urine?
Leukocyte esterase in urine is usually detected through simple laboratory tests that help identify its presence and underlying cause. While the primary method is a leukocyte esterase urine test, doctors often evaluate leukocyte esterase and WBC in urine together to determine whether an infection or inflammation is present.
1. Leukocytes Esterase Urine Test
Also known as the urine dipstick test, it is the quickest and most commonly used method to trace leukocytes in urine. Since the test provides results within minutes, it serves as an effective first step in identifying possible urinary tract problems. A finding of positive leukocytes in urine often prompts additional tests to confirm infection or inflammation. Based on the results, doctors generally determine whether further evaluation is required.
2. Urine Microscopy
Urine microscopy offers a detailed analysis of the urine sample by counting white blood cells, red blood cells, bacteria, and crystals. With these tests, doctors confirm whether the elevated leukocyte level is linked to a urinary tract infection or another underlying condition. Additionally, it also provides valuable clues that support a more accurate diagnosis.
3. Urine Culture
Under this laboratory test, the exact bacteria causing the infection are identified. In fact, this method not only confirms the diagnosis but also helps healthcare providers prescribe targeted treatment, reducing the risk of recurring infections.
4. Additional Diagnostic Tests
When urine tests are inconclusive or symptoms continue, doctors may recommend ultrasound scans, CT scans, or cystoscopy. These advanced investigations help detect conditions that may be responsible for the presence of leukocytes in urine. By combining these tests with other methods, doctors ensure timely and effective treatment.
How is the Leukocyte Esterase Urine Test Performed?
As the leukocyte esterase urine test is the most common and non-invasive method to detect leukocyte esterase, it will be beneficial to know how it works. This test result can be obtained within a day or immediately with a dipstick using the following methods.
- Clean the Genital Area: Before collecting the sample, it is essential to clean the virginal area with the provided wipes to ensure accurate test results.
- Collect a Clean-catch Urine Sample: Patients are usually asked to collect a midstream urine sample sample in a sterile container to reduce the risk of contamination.
- Dip a Urine Test Strip: A healthcare professional will place a special dipstick into the urine sample. After a few minutes, the chemicals contained in the strip will react with leukocyte esterase.
- Wait for the Reaction: The test strip changes colour within a few minutes if leukocyte esterase is present in the urine.
- Interpret the results: The colour change is compared with a reference chart. Sometimes, the results may indicate negative leukocytes but positive nitrites, a pattern that may require further diagnostic testing. Even trace leukocytes in urine may require monitoring if symptoms of a urinary tract condition are present.
Final Words
Leukocyte esterase in urine is an important indicator of your urinary health that you should not ignore. While a positive result often points to an infection or inflammation, it does not confirm the exact cause on its own.
Therefore, an early diagnosis through urine tests and timely medical treatment can help prevent complications and support a faster recovery. In case you ever notice persistent symptoms, always consult a healthcare professional for a proper evaluation and appropriate treatment.
Reader Information: This article is intended for general educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Consult a qualified healthcare professional for personalised guidance regarding leukocyte esterase or leukocytes detected in urine.
