Julie and I are on the same page, but my comment should have been more explanatory.
The different WBC types (Neutrophils or Polys, Lymphocytes, Monocytes, Eosinophils, and Basophils) are all reported by their percentages in the blood. By definition, then, all the numbers must add up to 100%.
So if a person has a bacterial infection, the neutrophils may sky-rocket to more than 90% or so. This means that the rest of the cell count percents must fall so that the sum is still 100%.
Julie is right that the more critical number is the Absolute count. This number is achieved by multiplying the percentage of that cell type times the total white cell count. If the Lymphs are a little low, one would look to the total count and also see if any other type is a higher % than usual. If the total WBC is very high, like 20,000 (as you would see in some infections, a low lymphocyte count might still have a normal absolute count.
The upshot here is that we can not look at a single number in a CBC and be able to say much about it. Only by looking at all the numbers do we get a sense that something is ou-of-whack (official medical term).
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