A white blood cell count of 3.9 is too low. Some things that can cause a low count include viral infections, some cancers, bacterial infections, and diseases of the liver and spleen.
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I had a CBC in my doctor office today and he told me my WBC was 2.9. He said I have an infection. But that still doesn't explain a low white blood cell count.
ref. range of total leucocyte count is 5,000 to 10,000/cumm.
if your mean 3.9 thousand /cumm, then it comes in the category of decrease level. and it is called leucopenia.
Assuming you mean 3900 it is considered below normal. The normal range is 4500-10000.