Monocytes high in blood: what does it mean?

White blood cells or leukocytes are a fundamental part of the blood components of our body and essential for the defense of the body. There are several classes of leukocytes, where each one collaborates with the fight against external agents that attack and make people sick.

Monocytes are a class of white blood cells and they are excellent as indicators, both of good health and of possible disorders in our body. They are part of the immune system and defend us against germs, bacteria, viruses or other pathogenic organisms. Therefore, it is said that its primary function is to protect and defend the immune system against any enemy.

What is this kind of leukocyte like?

They are the largest leukocytes and make up almost 8% of white blood cells that run through our bloodstream. They are created in the bone marrow and are intended to give stability to the body, eliminating invading microbes and germs, as well as any deformed or dead cells.

These white blood cells become macrophages, to consume and eliminate all the germs that are causing infections in our body. Macrophages are part of the cells of the immune system and phagocytosis is the best way to describe the work of monocytes. A job that means locating and identifying damaged cells and bodies that are in the body and then ingesting them, preventing them from damaging the immune system.

Normal values

The normal values They change from one medical laboratory to another, but are usually within the following ranges:

  • For adults, they range from 150 to 800 per mm3 of blood.
  • For children and adolescents, they range from 200 to 1,500 per mm3 of blood.
  • For newborns, they range from 360 to 3,000 per mm3 of blood.

These values ​​are only for reference within the blood tests.

Low values

Low values ​​are considered to be those less than 150 per mm3 of blood.

High values

High values ​​are considered to be those greater than 800 per mm3 of blood.

What do high blood monocytes mean?

The monocytes high in blood signify the suffering of monocytosis, this is due to the fact that the immune system to defend ourselves originates an excessive reproduction of monocytes.

The idea is to increase the number of macrophages to eat the viruses or bacteria that are attacking the body and causing infections. Therefore, it is said that having high monocytes in the blood is a symptom that there is an infection in our body. Well, the increase in monocytes in the blood is the reaction of our immune system to the danger caused by external agents.

When there is a high number of this type of leukocytes in the blood, they can also be caused by prescribed medication to combat serious diseases.

By increasing their amount in the blood, these cells can also cause some inflammatory diseases such as lupus or arthritis.

Some of the most common symptoms of high blood monocytes are fever, weakness or tiredness, and a general ill feeling, similar to those caused by colds.


The main cause of elevated blood monocytes It is due to some disease that is specifically damaging the work carried out by the immune system. In other words, monocytosis is a consequence of a condition that is damaging our immune system.

So it is said that high blood monocytes can be caused by infections or diseases such as:

  • Mononucleosis, tuberculosis, and syphilis, which are viral or bacterial infections.
  • Leukemia or Hodgkin’s disease, which are blood diseases or disorders.
  • Subacute bacterial endocarditis, a heart infection.
  • Other infections caused by bacteria that spread fleas, lice or ticks, among others.

For this reason, since there are many diseases that trigger elevated monocytes in the blood, it is recommended to go to a specialist to make a proper diagnosis. The increase in monocytes is usually discovered by making a hematology, because it usually does not produce symptoms.

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