Total Leucocyte Count

 

 

What is TLC?

Leucocytes, also known as white blood cells (WBCs) play an important role in our immune system of the body. These cells fight infections by attacking bacteria, viruses, and microbes, which invade the body. The five major types of WBCs include lymphocytes, neutrophils, eosinophils, monocytes, and basophils. Total Leukocyte Count Test measures the total amount of all the leukocytes in the blood.

 

Why is TLC done?

The Total Leukocyte Count Test is performed:

  • As a part of Complete Blood Count (CBC) Test in regular health checkup
  • To help diagnose infections and inflammation
  • To help diagnose conditions that decrease WBC count like bone marrow disorders
  • To monitor bone marrow function
  • To monitor chemotherapy treatment

 

What does TLC Measure?

Blood is made up of different types of cells suspended in a fluid called plasma. These include erythrocytes or red blood cells, leukocytes or white blood cells, and platelets. Blood cells are produced by the hematopoietic cells in the bone marrow and are then released into circulation. RBCs carry oxygen to the tissues, platelets help in blood clotting at a site of injury, and leukocytes from a part of the immune system of the body. WBCs are of five primary types: neutrophils, basophils, eosinophils, monocytes, and lymphocytes. Lymphocytes are further of three types: B-Lymphocytes, T-Lymphocytes, and natural killer (NK) cells. Neutrophils, basophils, eosinophils are collectively called granulocytes since they contain granules in the cytoplasm.

Depending on various factors like age, gender, health condition, environmental factors, etc., varying amounts of different types of WBCs circulate in the blood. The bone marrow increases the production of WBCs in response to an infection or inflammation anywhere in the body. These WBCs are called to the site by a series of chemical signals, where they work to treat the condition. During this time, the total leukocyte count remains high in the blood. Once the infection or inflammation subsides, WBC production by bone marrow decreases, and WBC count in circulation falls back to normal levels. A continuously elevated WBC count may thus be an indication of a chronic condition that is not resolving naturally and might need urgent attention.

Apart from an infection or inflammation, WBC count in the blood can also be affected by other conditions like disorders of the immune system, autoimmune conditions, cancer, etc. WBC count may be higher or lower than normal in these cases.

WBC count test serves as an indication of a condition affecting the body. Further tests are performed to confirm a particular condition and direct treatment.

 

 

 

 

 

 

 https://labpedia.net/white-blood-cell-part-2-total-leukocytes-count/

 https://bloodoxy.com/view/product/Lab-Tests-Health-Checkup/Lab-Test/TOTAL-LEUKOCYTE-COUNT-TLC/BOBT00093?id=93

https://www.healthline.com/health/wbc-count#normal-range 

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