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.
The list of other possible causes for a drop in a personâs white blood cell count is long. Autoimmune disorders, congenital disorders that affect the way bone marrow works, disorders of the spleen, certain infectious diseases, cancer and parasitic diseases, among others, can all lead to low white blood cell counts.