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2] multiplied by 10 high-power fields to arrive at the number 4.
Neild et al (13) reported a grade 2 infiltration of 20 to 50 IgG4-positive plasma cells per high-power field to be significant in cases with IgG4-related idiopathic retroperitoneal fibrosis when compared with controls.
At this concentration, at least 1 high-power field containing yeast was identified in 11 (92%) of 12 smears.
The mitotic rate was high, with an average of 2 per high-power field (Figure 4, hematoxylineosin, original magnification x400).
Mitoses may be seen, with an upper limit of about 4/10 high-power fields without any atypical forms.
The response includes (a) peritumoral lymphocytes, defined as lymphocytic aggregates apparent at a scanning magnification, and (b) the presence of tumor-infiltrating lymphocytes, defined as lymphocytes within tumor cell nests or glands (a score of >40 lymphocytes per 10 high-power fields indicates a positive finding).
As clinical chemists know, there are thousands of high-power fields on a slide of a single sample.
Mitoses were variable, ranging from 0 to 30 mitoses per 50 high-power fields.