Trace element test for pregnant women, potassium, sodium, chloride, iron and calcium are necessary, while other elements are not necessary. Trace elements are involved in the body’s tissue repair, growth and development, cell division and other processes, if a pregnant woman is deficient in trace elements, not only will lead to anemia, decreased immunity and other symptoms, but also affect the growth and development of the fetus, resulting in fetal growth retardation, underdevelopment, congenital malformations, etc., therefore, pregnant women are necessary to carry out a common trace element test, such as potassium, sodium, chlorine, iron, calcium and these. Pregnant women should ensure balanced nutrition during pregnancy, eat more fresh fruits and vegetables, and supplement enough high-quality protein. If there is a deficiency of trace elements, they should be supplemented in time under the guidance of professional doctors.