White blood cells in urine without pain: what could that mean?

Leukocytes in urine are white blood cells that may indicate inflammation or irritation in the urinary tract. People often immediately think of a urinary tract infection, but leukocytes can also be present in cases of an STD, kidney stones, prostate problems, contamination of the urine sample, or a silent infection. Especially if leukocytes are repeatedly elevated, nitrite is negative, or there are no symptoms, further testing is advisable.

An abnormal urine test can be quite alarming, especially if the results show elevated leukocytes in the urine.

Many people immediately think of a bladder infection. But what if you don’t have any pain at all when you urinate? No burning sensation? No fever? And maybe even a negative nitrite test?

That’s when it gets confusing.

Leukocytes are white blood cells. They are part of your immune system. If they are found in urine, this may indicate inflammation, irritation, or infection somewhere in the urinary tract. However, leukocytes do not automatically reveal where the problem is located, nor do they always indicate the cause.

A positive leukocyte test does not automatically indicate what is wrong. It is a sign that must be evaluated in context.

Leukocytes in urine: what exactly do they mean?

Leukocytes are white blood cells. Your body sends them to areas where there is inflammation, infection, or tissue irritation. If leukocytes are found in urine, it may indicate that something is going on somewhere in the urinary tract—for example, in the bladder, urethra, kidneys, prostate, or ureters—or it may simply be due to contamination of the urine sample.

In a classic case of a bladder infection, leukocytes are often associated with symptoms such as frequent urination, a burning sensation, lower abdominal pain, and urinary urgency. However, leukocytes may also be present without any obvious symptoms.

The NHG Standard for Urinary Tract Infections states that cystitis is diagnosed by a combination of urinary tract symptoms with a positive nitrite test, a positive dipslide, or a positive sediment test. In other words: the results of a urine test strip must always be evaluated in conjunction with the symptoms.

When white blood cells indicate a silent infection

Sometimes leukocytes are present in urine without any obvious pain. This may be consistent with a mild or early-stage urinary tract infection, but it can also be consistent with an infection that causes few symptoms.

This is sometimes called a “silent” infection, though you should be cautious about that term. Not every abnormal urine test result without symptoms requires treatment. Especially in people without symptoms, it’s important to distinguish between a true infection, asymptomatic bacteria, contamination, and other causes of inflammation.

Extra caution is warranted in pregnant women, the elderly, people with diabetes, people with kidney problems, people with weakened immune systems, men with urinary tract symptoms, and people with a fever or flank pain.

If you have a fever, pain in your side or back, feel unwell, have nausea, or chills, you should consider the possibility of a urinary tract infection with signs of tissue invasion, such as pyelonephritis. In that case, a medical evaluation is necessary. The NHG guideline distinguishes between cystitis and a urinary tract infection with signs of tissue invasion, as these require different management approaches.

Nitrite negative, leukocytes positive: what does that mean?

A common result is: leukocytes positive, nitrite negative.

This raises questions. That’s because nitrite is often used as an indicator of bacteria in the urine. If the nitrite test is negative, people sometimes assume that means there is no infection.

But it’s not that simple.

The nitrite test has a good positive predictive value, but a negative nitrite test does not always rule out a urinary tract infection. Some bacteria do not produce nitrite, and sometimes urine has not been in the bladder long enough to form nitrite. The guidelines database states that, in cases of clinical suspicion of a urinary tract infection, a negative nitrite test may be followed by sediment or leukocyte analysis.

Possible explanations for a positive leukocyte result and a negative nitrite result are:

• Early-stage urinary tract infection
• Bacteria that do not produce nitrite
• Urine that has been in the bladder for a short time
• Inflammation without a bacterial urinary tract infection
• STD-related urethritis
• Kidney stones or irritation
• Contamination of the sample
• Recent antibiotic use

That is why this combination is primarily a reason to investigate further, not to jump to a single conclusion right away.

Bacterial infection or irritation: the difference when leukocytes are present in urine

Leukocytes indicate immune system activity, but not always a typical bacterial bladder infection.

A bacterial urinary tract infection is usually caused by bacteria that enter the bladder through the urethra. This can lead to symptoms such as a burning sensation when urinating, frequent urination, and pain in the lower abdomen.

However, irritation or inflammation can also have other causes, such as:

• Kidney stones or grit
• Vaginal irritation or discharge
• Sexually Transmitted Infections
• Prostatitis
• Urinary catheter
• Intense physical exertion
• Chemical irritation caused by soap, vaginal products, or lubricants
• Contamination during urine collection

In such a situation, leukocyte levels may be elevated, even though a standard urinary tract infection is not the most likely explanation.

That is also why follow-up testing can be important. A dipstick is useful as an initial screening tool, but it does not always answer the question: what is the cause?

Why you should also consider an STD if you have recurring abnormalities

When leukocytes are found in urine without obvious symptoms of a bladder infection, an STD is sometimes overlooked. Yet this can be a significant cause, especially among sexually active people.

An STD can cause inflammation in the urethra or cervix. As a result, white blood cells may be found in the urine, even if the standard urine culture is negative or if nitrite levels are not elevated.

An STD test is recommended if:

• Leukocytes in urine without obvious symptoms of a urinary tract infection
• Burning sensation when urinating after sexual contact
• Discharge from the penis or vagina
• Bleeding after sex or spotting
• Lower abdominal pain
• New or changing sexual partners
• A partner with symptoms or a positive STD test
• Repeated abnormal urine test results without a clear bacterial cause

The CDC describes urethritis as inflammation of the urethra that can have both infectious and non-infectious causes. Symptoms may include pain or itching during urination and discharge, but symptoms may also be present in people without obvious symptoms.

Major STDs that can cause urinary tract-like symptoms or inflammatory cells include chlamydia, gonorrhea, Mycoplasma genitalium, and trichomoniasis. A standard urine dipstick test cannot reliably distinguish whether leukocytes are caused by a bladder infection or by an STD. Specific STD testing is required for this.

The role of leukocytes in kidney stones and prostate problems

Leukocytes in urine can also occur due to mechanical irritation, such as kidney stones or gravel. A small stone can irritate the mucous membrane and cause an inflammatory response. Sometimes, blood is also present in the urine.

Kidney stones may be the cause of your symptoms if you are experiencing:

• Attacks of severe pain in the side or back
• Pain radiating to the groin or lower abdomen
• Blood in the Urine
• Nausea or vomiting
• Urge to urinate due to pain
• Previously: Kidney stones

In men, the prostate may also play a role. Prostatitis or an enlarged prostate can cause urinary symptoms and is sometimes accompanied by abnormalities in the urine, recognizable by:

• Difficulty starting to urinate
• Weak urine stream
• Dribbling
• Frequent urination in small amounts
• Nocturia
• Pain in the pelvis, lower back, or perineum
• Fever or feeling sick with acute prostatitis

For men with urinary tract symptoms, it’s especially important not to assume it’s just a simple bladder infection.

Follow-up testing: from a simple dipstick to a laboratory test

A urine test strip is a quick first step. However, if there is any doubt or if abnormal results recur, more extensive testing is often advisable. These are the possible next steps:

Urine sediment

This test examines cells and particles in urine, such as leukocytes, erythrocytes, bacteria, and crystals.

Urine Culture

A culture can identify which bacteria are present and to which antibiotics they are susceptible. This is especially important in cases of recurring symptoms, complications, pregnancy, men, or suspected pyelonephritis.

STD test

If you have engaged in risky sexual behavior, are experiencing discharge, or have a burning sensation when urinating without a clear urinary tract infection (UTI), or if you have repeated positive leukocyte results and negative nitrite results, an STD test is recommended.

Kidney Function Test

In cases of recurring urinary abnormalities, protein in the urine, blood in the urine, or high blood pressure, a blood test to assess kidney function may be advisable.

Comprehensive Urinalysis

This can help assess not only leukocytes but also protein, albumin, blood, nitrite, glucose, ketones, and specific gravity.

In its guidelines, the European Association of Urology emphasizes that the diagnosis and treatment of urinary tract infections must be carried out with care, in part to limit unnecessary antibiotic use and resistance.

What if you find something you weren’t looking for?

During a urinalysis, you sometimes find something you weren’t specifically looking for. For example, leukocytes during a general health checkup, or blood in the urine even though you had no symptoms.

We call this an incidental finding: an abnormality discovered outside the scope of the original test. The RIVM describes incidental findings as conditions or abnormalities that are sometimes found during screening even though they were not specifically being looked for.

Such an incidental finding does not necessarily indicate a serious condition, but it does call for a prudent next step: Do the results match the symptoms? Could the sample have been contaminated? Were there temporary causes such as menstruation, exercise, or an infection? Should the test be repeated? And is further testing necessary?

When leukocytes are found in urine without any symptoms, that’s exactly the right approach: don’t ignore it, but don’t panic right away either.

Natural Support for Leukocytes in Urine: Practical Tips

If you frequently experience urinary tract symptoms or abnormal urine test results, you can support your urinary tract with general lifestyle changes. This is not a substitute for a medical examination if you have persistent or severe symptoms.

What helps in practice:

• Drink enough, but don’t force yourself to drink extreme amounts of water
• Urinate after sexual contact if you are prone to urinary tract issues
• Don’t hold off on urinating for too long
• Do not use irritating soap or vaginal douches
• Be aware of constipation, as it can put pressure on the bladder and urinary tract
• Discuss recurring symptoms with your primary care physician
• If abnormalities persist, have a more thorough examination performed
• Get tested for STDs if you’re at risk

Cranberry, D-mannose, and probiotics are often mentioned in connection with urinary tract support. The strength of the evidence varies by product and by target group. Consider these as potential support, not as a substitute for diagnostic testing in cases of abnormal urine or symptoms.

When should you seek immediate medical attention?

Contact a doctor if:

• Fever
• Chills
• Pain in the side or back
• Nausea or vomiting
• Visible blood in urine
• Pregnancy with urinary tract symptoms
• Man with urinary tract symptoms
• Diabetes or a weakened immune system with symptoms
• Suddenly urinating much less frequently
• Feeling seriously ill
• Flank pain
• Recurring Abnormal Urinalysis Results

At Bloedwaardentest, if an abnormality is found that may require immediate medical follow-up, you will always be contacted first by a doctor or medical expert.

Have your urine tested for specific conditions

The presence of leukocytes in urine does not automatically mean you have a urinary tract infection. Especially if you have no pain, your nitrite test is negative, or the abnormality recurs frequently, it’s wise to investigate further.

At Bloedwaardentest, you can have a targeted urine test performed and, if indicated, additional testing for STDs or kidney function. Blood draws are available at more than 1,000 locations throughout the Netherlands. A telephone consultation or lifestyle consultation is available as an option.