A calculated measurement in which the number of neutrophil granulocytes is divided by the number of all white blood cells in a specified sample of peripheral venous blood, and the result presented as a ratio, fraction, quotient or percentage. A neutrophil is, or is in the process of becoming, a granular leucocyte having a nucleus with three to five lobes connected by threads of chromatin, cytoplasm containing very fine granules, and which is readily stainable with neutral dyes.