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The most frequently requested laboratory test is the full blood count. This is not one single test but a group of tests, including a count of three functionally distinct cellular elements that circulate in peripheral blood: platelets, red cells (erythrocytes) and white cells (leukocytes). This paper focuses on the function of leucocytes and the clinical significance of abnormal changes in their numbers.
The most frequently requested laboratory test is the full blood count. This is not one single test but a group of tests, including a count of three functionally distinct cellular elements that circulate in peripheral blood: platelets, red cells (erythrocytes) and white cells (leukocytes). This paper focuses on the function of leucocytes and the clinical significance of abnormal changes in their numbers.