What are monocytes in a blood test?

Monocytes are a type of white blood cell that are part of the body's immune system. They are produced in the bone marrow and circulate in the bloodstream. Monocytes are larger than other white blood cells and have a bean-shaped nucleus. They are also very mobile and can squeeze through small blood vessels to reach areas of infection or inflammation.

Monocytes play an important role in the body's defense against infection. They can engulf and destroy foreign particles, such as bacteria and viruses. They also release chemicals that help to kill bacteria and promote healing.

The normal range of monocytes in a blood test is between 2% and 10% of the total white blood cell count. A higher than normal monocyte count may indicate an infection, inflammation, or certain types of cancer. A lower than normal monocyte count may be caused by a variety of conditions, including chemotherapy, radiation therapy, and certain autoimmune diseases.

Monocyte counts are often included as part of a routine blood test. Your doctor may order a blood test to check your monocyte count if you have signs of an infection, inflammation, or certain types of cancer.