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.
A low white blood cell count usually is caused by one of the following: 1  Viral infections that temporarily disrupt bone marrow function. 2  Congenital disorders characterized by diminished bone marrow function. 3  Cancer or other diseases that damage bone marrow.