Four-year-old babies with prolonged low-grade fever may be seen in infectious diseases, rheumatic diseases, malignant tumors, etc. The items that need to be examined are related to the specific conditions, such as routine blood tests, blood sedimentation, C-reactive protein, calcitonin, blood culture, chest radiographs, chest CT, and bone marrow aspiration.
1. Infections: children with low immunity may have recurrent infections with fever symptoms, and need to improve the blood routine, blood sedimentation, C-reactive protein, calcitonin, blood culture, chest X-ray and other relevant examinations to clarify the cause of the disease.
Special infections, such as EBV infection, cytomegalovirus infection, Mycobacterium tuberculosis infection, etc., need to improve the EBV, cytomegalovirus DNA test, as well as tuberculin test and other related examinations to clarify the condition.
2. Rheumatic immune diseases: for example, fever caused by autoimmune diseases, it is necessary to improve the blood routine, autoantibody test, ultrasound and other related examinations to clarify the condition.
3. Malignant tumors: such as leukemia, pheochromocytoma and other diseases, need to carry out bone marrow puncture, blood free methoxy epinephrine and methoxy norepinephrine and other related tests to clarify the condition.
It is also necessary to exclude other systemic diseases, such as hyperthyroidism and other endocrine diseases, need to improve the thyroid function and other related tests to clarify the condition.
There are many causes of prolonged hypothermia in babies, which need to be analyzed according to the specific condition of the child, and it is recommended to go to a regular hospital and be evaluated and treated by a specialist.