What does it mean to have 0.6 white blood cell count?

A white blood cell count of 0.6, or 600 cells per microliter, is considered low and indicates leukopenia, which can impair the immune system's ability to fight infections. This condition may be caused by various factors, including bone marrow disorders, autoimmune diseases, certain medications, or viral infections. It's important to consult a healthcare provider for further evaluation and potential treatment, as the underlying cause needs to be identified.