<s>[INST] My son who is 2 years and three month old is having constant fever but it goes up a down averaging 102. I have him tested and his Paletelet count is 131,000 and ALT level is 46 where as Lab normal range was 40. One other thing is him Hemoglobin is 10.3. He is not eating much, vomit when eats some thing. What more tests should I do to diagnose the cause of fever? [/INST] Hi...NO NEED TO DO ANY FURTHER TESTS. Seems like a viral illness by the tests and by what you quote. Fever of few days without any localizing signs could as well a viral illness. Usually rather than fever, what is more important is the activity of the child, in between 2 fever episodes on the same day. If the kid is active and playing around when there is no fever, it is probably viral illness and it doesn't require antibiotics at all. Once viral fever comes it will there for 4-7 days. So do not worry about duration if the kid is active. Regards -  </s>