<s>[INST] HiMy son is 13 - for the past 6 months has been looking tired with dark circles around his eyes.  For the past 3 weeks he has been very tired, with a constant headaches at the back and top of his head, lower appetite.  He is usually very active, lots of sport, and large appetite for healthy food.  Blood test done - low in white blood cells, low in iron.  WBC count repeated today at my insistence - I have been informed it is probably an infection and needs to work its way of of his system.  What should he be testing for if his WBC count remains low?Thank you [/INST] Hi, Thanks for asking. Based on your clinical history and query, my opinion is as follows:1. All the symptoms appear to be nutritional, possibly vitamin and mineral deficiency.2. WBC count reduction - Bone marrow aspiration will confirm. Iron stores can also be evaluated simultaneously3. Since he is anemic, he is feeling tired and has dark circles, etc. Improvement of nutrition is very important and diet should concentrate on minerals and vitamins. If required, supplements can be taken. Any further queries, happy to help again. </s>