Is trace element detection necessary

Recently, the Southern Metropolis Daily reported that "trace element testing, except for blood lead, has no value at all." However, over the years, trace element testing in hospitals has continued to be carried out, and even some health care institutions, under the guise of trace element testing, poke their fingers and test their blood to tell parents and children what they lack, Is it necessary to do these inspections? What are the symptoms of children's lack of trace elements? How to prevent?

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