What does borderline white blood cell count mean?

Ambiguity: Lab studies all have a reference range. For example the general range for WBC is 4500-10, 500 cells/mm3. This range is also affected by your ethnic background, so borderline is a very loose term. At either margin, it is could indicate an infection or other inflammatory condition or just a variation of your normal. If you are having pain or fever or other worrisome symptoms consult with your doctor.

Close to normal: The normal white blood cell count varies mildly with each laboratory but roughly is between 5.0-10.0 the term " borderline" is used for any slight variation of that range ( up or down). Your provider will determine the significance of it and if it's necessary further follow up.

Blood Tests: This is too ambiguous to answer. What is the reason you were tested? Was the white blood cell count borderline high or low? What else was found on the labs? What is the rest of the story?

Depends: If your white blood total count is borderline low it may be a normal variant occurs more in blacks.