zinc blood test is performed to measure the level of zinc in your blood, helping to diagnose either a deficiency or excess of zinc. Zinc is essential for immune function, wound healing, and cell growth.

copper testing is primarily ordered to help diagnose Wilson disease, a rate inherited disorder that can lead to excess storage of copper in the liver, brain and other organs. The tests most typically ordered are a total and/or free (unbound) blood copper test along with a caeruloplasmin level.