D.C.
It could just be from anemia. Get it retested asap. Call right now and schedule it if you haven't already. Drs forget sometimes that most people don't know what test results really mean. It can be very scary to research the internet for answers and so much info out there is wrong. If your pediatrician won't answer your questions and help you understand what's going on with your child, then it may be time to find a new one.