This test is used to evaluate deficiencies in zinc. Zinc is an essential element; it is a critical cofactor for carbonic anhydrase, alkaline phosphatase, RNA and DNA polymerases, and many other physiologically important proteins. Zinc deficiency is associated with several diseases. In children it causes growth retardation, infection susceptibility, delayed sexual maturation, and diarrhea, contributing to the death of about 800,000 children worldwide per year. Zinc Serum test is one of the simplest tests for diagnosing zinc deficiency which is the cause of the above mentioned health problems.