abs = absolute count. It is the number of that type of cell in a given volume.
CD8 identifies suppressor/ cytotoxic lymphocytes.
CD57 identifies a type of cell called a natural killer (NK) cell.
If they mean CD8 positive and CD57 positive it is the count of NK cells.
If they mean CD8 positive and CD 57 negative then it is the count of suppressor T cells (that are not N cells).
What 28 means would depend on the units.
Sorry to be a bit complicated. Basically, they are counting a specific type of white blood cell.
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