That's a good question. I can imagine that there was a time before there was life on Earth, and then clearly there was a time X-hundred thousand years or a million years later when there were things that we would all recognize as biological.
A high count indicates the presence of inflammation in the body. Because white blood cells are calculated by the number of cells per volume of blood, test results can vary between labs. Different labs use different degrees of measurements for the white blood cell count.
Specific causes of low white blood cell count include: 1  Aplastic anemia. 2  Certain medications, such as antibiotics and diuretics. 3  Chemotherapy. 4  HIV/AIDS. 5  Hypersplenism, a premature destruction of blood cells by the spleen.6  Infectious diseases. 7  Kostmann's syndrome, a congenital disorder involving low neutrophil production.8  Leukemia.pecific causes of low white blood cell count include: 1  Aplastic anemia. 2  Certain medications, such as antibiotics and diuretics. 3  Chemotherapy. 4  HIV/AIDS. 5  Hypersplenism, a premature destruction of blood cells by the spleen. 6  Infectious diseases. 7  Kostmann's syndrome, a congenital disorder involving low neutrophil production. 8  Leukemia.