What is WBC Count?

The total counts several types of white cell, all made in the bone marrow. It says how many immune cells are circulating, but not which type has risen or what the body is fighting.

Neutrophils are normally the most abundant type, so the total follows them, and a change confined to one of the less numerous types can pass without moving it much. Neutrophil Count separates neutrophils from the rest: if the total has moved and the neutrophil number has not, the change came from one of the less numerous types.

Infection and inflammation lift the total most often, prompting the marrow to release more cells into the blood. Physical exertion raises the total within a single day, and it settles again afterwards.

Illness and exertion both move the count within a day or two, and both pass. By the time of the next annual test neither is still in the figure, so what two readings share is the level the count sits at when nothing is acting on it. This is Do Health's monitoring schedule, not a general recommendation for everyone.