What is the normal range for CD4 cell count?

The normal range for CD4 cell count is indeed between 200 and 400 cells per cubic millimeter of blood. CD4 cells, also known as T-helper cells, play a crucial role in the immune system by helping to coordinate the body's response to infections. A count within this range indicates a healthy immune system and the ability to fight off infections effectively.

Values below 200 may suggest a significantly weakened immune response, which is often used as a criterion for diagnosing AIDS in HIV-infected individuals. Levels above 400 indicate a more robust immune function. Therefore, a CD4 count within the 200-400 range reflects a state where the immune system is still capable of functioning adequately, thus making this the appropriate choice for normal CD4 cell counts.