Trace element testing for people of all ages, each age group has different levels of trace elements, but it is not advisable to use trace element testing as a census program such as a physical examination. When there are symptoms of malnutrition, developmental delay, chronic diarrhea, severe picky eating, partiality, hyperactivity, inattention, anemia, immune dysfunction, recurrent respiratory infections, certain skin diseases and gastrointestinal discomforts, or occupational groups exposed to heavy metals for a long period of time, etc., you may consider going to the regular hospital to test for trace elements.