Leukocytes: What are they? Types, Function, Presence in Urine, Causes, Recommendations and Treatment

Also called white blood cells, they are part of the immune system.

They fight against the germs that cause diseases and infections, and they also strive to protect the body against any foreign agent that appears to be a threat.

Some produce weapons in the form of antibodies, while others make direct attacks. Depending on the type of leukocytes, they can kill completely by devouring specific invaders or notify other leukocytes that an invasion has taken place.

These cells are produced and stored in various body parts, including the thymus, spleen, and bone marrow.


Leukocytes travel throughout the body, moving between the organs and the knots. They look for germs or infections that can cause problems.

Only if there are low levels of leukocytes can they be found in the urine. A large number of leukocytes in the urine may indicate an infection or other underlying medical problem.


Five different Leukocytes perform specific tasks based on their abilities and the origin or characteristics of the invaders they are fighting against.


They are usually known as:

Presence of leukocytes in the urine

Leukocytes may be present in the urine for a variety of reasons.

Infections or irritation of the bladder:

General medical check-ups can show multiple abnormalities in the body or body, usually when a urine test is performed, and a high level of leukocytes is found in the urine:

Kidney stones: a urinary tract infection (UTI) is one of the most common causes of leukocytes in the urine. It also includes bladder, kidneys, urethra, bladder, and ureters conditions.

Urine naturally contains salts and dissolved minerals—people with high levels of these minerals and salts in their urine risk developing stones.

Stones that reach the urethra can interfere with the movement of urine. This blockage can cause bacteria to accumulate and cause an infection.

Kidney infection: a kidney infection can cause higher rates of white blood cells in the urine.

These infections often begin in the urinary tract and spread to the kidneys. Although it is unusual, it is also possible for bacteria from other areas of the body to spread through the bloodstream to the kidneys.

People with weak immune systems or who have been using catheters for prolonged periods have a higher risk of developing a kidney infection.

Blockage of the urinary system: a blockage can lead to the development of hematuria and blood in the urine. The blockage may be due to trauma or caused by kidney stones, tumors, or other foreign material.

Pregnancy: pregnant women usually have a higher level of leukocytes in the blood than usual. This is a regular occurrence. Unless high levels become a persistent problem or are accompanied by abnormal symptoms, they are not dangerous.

Unusual changes in urine: Changes in urination or painful urination can be a symptom of leukocytes.


There is a reason people should not have the habit of containing their urine and that long periods can weaken the bladder and hinder emptying.

A bacterial infection may occur if urine builds up in the bladder for too long.

This infection can lead to higher levels of leukocytes in the urine.

Other causes

These are just some of the common causes, but there are others. Elevated levels of leukocytes in the urine can also be caused by the following:

  • Some cancers, such as prostate, bladder, or kidney cancer.
  • Diseases of the blood like anemia.
  • Some pain medications and anticoagulants.
  • Strenuous or excessive exercise.


Symptoms vary from person to person, but some signs suggest that leukocytes may be present in the urine.

One of the most visible signs is turbid or smelly urine. Urinating more often than usual, pain or burning sensation when urinating, or blood in the urine are also signs.

Other symptoms include:

  • Tremor and fever.
  • Pain in the upper part of the back and lateral pain.
  • Stomach ache.
  • Nausea or vomiting
  • Long-term pelvic pain.


People who notice any of the above symptoms should contact their doctor for a more detailed examination.

A urinalysis may be sufficient to detect any problem. Patients provide a urine sample that can be analyzed in three ways: visual examination, dipstick test, and microscopic examination.

If blood or other substances are present in the urine, other tests are often done to see exactly what is causing the problem.

It is possible to have white blood cells in the urine but not a bacterial infection. Sterile pyuria refers to the presence of white blood cells in the urine when no bacteria are present.


Avoid situations that trigger urinary tract infections.

Generally, women experience urinary tract infections for many reasons. With the help of antibiotics, it is possible to eradicate them.