Figure 6-7.

A, Normal fluid/transudate.

Note the macrophage and small lymphocyte with several erythrocytes. Normal fluid and transudates contain very low nucleated cell counts (less than 1000/μL) and low protein content (less than 2.5 g/dL). (Methanolic Romanowsky; HP oil.) B, Modified transudate. Pleural. Cat. The effusion cells have been concentrated in this animal with cardiomyopathy and display mild inflammation. Note a large macrophage, many small lymphocytes, and nondegenerate neutrophils. This fluid had a protein of 2.5 g/dL and an increased nucleated cell count of 4000 cells/μL. The macrophage has phagocytized a red blood cell. (Methanolic Romanowsky; HP oil.)