CD4 counts are much higher for children than adults. A new-born baby for example can have a CD4 count that is 2-3,000 cells/mm3.
Because of this, children are monitored using CD4 percentage (CD4%). This is the percentage of white blood cells (lymphocytes) that are CD4 cells. The CD4% of an HIV-negative person is around 40%.
|HIV disease category||CD4%||CD4
0-12 months old
1-5 years old
6-12 years old
|Category 1 – no damage||25% or over||over 1,500||over 1,000||over 500|
|Category 2 – moderate||15-24%||750-1,500||500-1,000||200-500|
|Category 3 – severe||less than 15%||less than 750||less than 500||less than 200|