My white blood cell count is 11.7, what does that mean?

Probably infection: White blood cells (or leukocytes) are cells of the immune system that defend the body against infection and foreign bodies. The reference range (normally) is between 4.1 - 10.9 x10^3. Your value is very slightly elevated which usually means you're fighting an infection. Hope that helps!

Maybe nothing: The upper range of "normal" is about 10,000. Being slightly up is not really a big deal. White blood counts rise in the face of an infection or inflammation. It's your body's immune system doing its job. You may be fighting off a viral infection, or it may be "normal" for you. Why was it done?