n :  an age classification of blood granulocytes and esp. neutrophils that is based on the number of lobes of the nucleus with increasing lobulation regarded as indicative of increasing age - see SHIFT TO THE LEFT SHIFT TO THE RIGHT  - compare SCHILLING INDEX 
 
Arneth, Joseph (1873-1955), German physician. Arneth specialized in hematology and wrote several studies of diseases of the blood. He introduced the Arneth index in 1904 and advocated its use as a valuable aid in determining the reaction of bone marrow to infectious agents.
 
 
 
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