At present, blood tests for pediatric trace elements are given in hospitals, and the approximate laboratory values are as follows: the standard reference value for copper is 9.13-31.8 μmol/L. The reference value for iron is 7.24-9.31 mmol/L. The reference value for magnesium is 1.24-1.75 mmol/L. The reference value for zinc is 60.93-102.56 μmol/L. The reference value for calcium is 1.57-2.14 mmol/L. The reference value for lead is 0-100 μg/L. The reference value for lead is 0-100μg/L. The specific test fluctuates up and down depending on the actual hospital situation.