[Histonet] cellular infiltration score

[=?gb2312?B?1qO0us+8?=]

   Hello, everyone. I stained the monoclear cells(CD4,CD8,CD20 and CD68) in kidney tissue sections by immunohistochemistry. I want to know how to score the cellular infiltration. If can I set the score as follows: <100/mm3-normal, >200/mm3-mild, >300/mm3-moderate, ...... I am waiting for your kindly reply. 
Sincerely, 
Betty 
Nanjing University School of Medicine, 
Research institute of Nephrology, Jinling Hospital, 
Nanjing, China 210002
Tel: 86-025-81765894