One often used test in blood analysis that provides valuable insights into the immune system is the total leucocyte count. The quantity of white blood cells (WBCs), the body’s defenders against illness, in the patient’s blood is determined by this test. In view of the aforementioned results, it is evident that the general health state of the population can be better understood by understanding the normal TL range, the factors that influence it, and the implications resulting from either a high or low range.