CD4 Count
In this series of graphics the three basic cell types found in blood (leukocytes, erythrocytes and platelets) have been depicted. The graphics further explain the leukocyte cell lines and include the granulocytes, monocytes and lymphocytes and the different cells which make up these groups of cells.
When measuring disease states it is an absolute CD4 count which is used to monitor patients.
Although CD4 cell counts are used to measure HIV disease states absolute CD4 counts are not a reliable marker when determining disease states in children. This is because lymphocytes are present in higher numbers in children thus making the count less accurate. The WHO has therefore recommended that all children under the age of 5 should be evaluated with a CD4 percentage when assessing disease status and decision making for initiation of treatment.
