Table 1.

h score index

Staining intensity		Staining extent
0	No staining	0	No staining
1	Slight staining	1	% 0–25
2	Mild staining	2	% 26–50
3	Severe staining	3	% 51–75
		4	% 76–100
h = staining intensity X staining extent

The h score index shows the staining intensity and its extent