That's ok. Just wanted to understand you
I wouldn't rush to my deathbed yet if I were you.

A count of 3.0–5.0 would be considered mild leukopenia.
This one lone test being low could be many things, even an ill performed test. What did your doctor suggest?
Based on the laws of probability, 1 out of 20 (or 5%) determinations will fall outside the established reference range, thus a single test value may mean nothing significant. Generally, the test value is only slightly higher or lower than the reference range. To put this in more perspective: If a doctor runs 20 different tests on you, there’s a good chance that one result will fall out of a reference range despite the fact that you are in good health.
Of course, the result may indicate a problem. The first thing your doctor is likely to do is to re-run the test. This accomplishes two things--1) to make sure the test was done right 2) if it was done right, to see if it's changed since the last test which would indicate a worsening or bettering of your situation.
A test result outside the reference range may or may not indicate a problem—the only sure signal it sends is that your doctor should investigate it further. You can have an abnormal value and have nothing wrong—but your doctor should try to determine the cause. It’s possible that your result falls in that 5% of healthy people who fall outside the statistical reference range.
Irregardless of the WBC, you still need an HIV test since you've had a few unprotected sexual encounters. Even if you don't do it for yourself, do it for anyone in the future that you have sex with because really, would you want to give anyone else HIV? There is an FDA approved test kit that you can do at home.
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Good luck to ya and get another WBC