R70-R79: Abnormal findings on examination of blood, without diagnosis

R72: Abnormality of white blood cells, not elsewhere classified

Blood is made up of a liquid part and different blood cells, among other things. The blood cells include the red blood cells, the white blood cells and the platelets. White blood cells are part of the body’s immune system. They fight pathogens.

There are different reasons why the white blood cells may have changed. For example, changes in white blood cells can occur when there is some immune system disorder.