cy·tom·e·try 
(sī-tŏmĭ-trē)
(sī-tŏmĭ-trē)n.
The counting and measuring of cells, especially the counting and analysis of cell size, morphology, and other characteristics, traditionally performed using a standardized glass slide or small glass chamber of known volume.
cy′to·metric (-tə-mĕtrĭk) adj.