How many T-cells are in the immune system normally?
There are normally trillions of T-Cells in your body at any one time. Physicians measure T-Cells per micro-liter of blood. A normal T-Cell count ranges between 800-1500 per micro-liter. A low T-Cell count (less than 200 per micro-liter) can be seen with active HIV infection. However, low T-Cell counts may occur with many other infections or diseases.
