Understanding White Blood Cell Counts: Normal Ranges by Age

The normal range for white blood cell count is:

- Adults : 4,000 to 11,000 white blood cells per microliter of blood (4.0 to 11.0 x 109/L)

- Newborns : 9,000 to 30,000 white blood cells per microliter of blood (9.0 to 30.0 x 109/L)

- Infants : 5,000 to 19,000 white blood cells per microliter of blood (5.0 to 19.0 x 109/L)

- Children (ages 1 to 18) : 5,000 to 15,500 white blood cells per microliter of blood (5.0 to 15.5 x 109/L)