Kim: need more info, sorry.
Your hematocrit (% of red blood cells in serum) is usally about 3 times your hemoglobin level. If you are anemic, there are a lot of different types and reasons why. Need to know your RBC morphology - my first guess would be iron deficiency anemia (based on most common). However, most endurance women athletes (if you were at Kona, that certianly counts) have little to no menstration anymore.
A single lab test with a low white blood cell count means very little in the abscence of other symptoms/lab findings. Repeat the bloodwork in a few weeks. Also, there should have been a breakdown here as well (%neutrophils, etc.)