Finding the right tests…
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Finding the right tests…
Biochemistry
Copper is a trace element your body needs in tiny amounts, but its jobs are outsized for how little of it circulates — it works alongside iron to help form red blood cells, and it supports healthy blood vessels, nerves, immune function, and bone. Most people get enough from an ordinary diet, so a copper test is ordered to answer a specific question rather than as routine screening: either that too little copper is reaching the body, or, less commonly, that too much has built up. Because copper in blood is mostly carried by a liver-made protein called ceruloplasmin, this test is usually ordered alongside a ceruloplasmin test rather than by itself.
The test reports the concentration of copper circulating in your blood. A low result can reflect poor dietary intake, a condition that prevents your gut from absorbing copper properly, or a genetic disorder that affects how your body handles it. A high result is less common and, alongside a high or abnormal ceruloplasmin level, can point toward copper accumulating somewhere it shouldn't — most notably in Wilson disease, a rare inherited condition that stops the body clearing excess copper.
Deficiency is the more familiar side of this test. Too little copper can show up as a type of anaemia and weakened bone density, since copper works with iron in forming red blood cells and plays a role in bone structure. This can develop from a diet consistently low in copper-rich foods, from conditions that impair absorption in the gut, or, in some cases, from taking excessive zinc supplements over a long period, since zinc competes with copper for absorption.
Excess copper is rarer but more serious when it happens. Wilson disease is the main condition doctors are checking for when copper builds up: a genetic fault stops the liver from clearing copper normally, so it accumulates in the liver, kidneys, and brain over time, and can eventually cause hepatitis, kidney problems, and neurological symptoms if it isn't caught. Because copper travels through the blood mostly bound to ceruloplasmin, a low ceruloplasmin alongside unusual copper handling is one of the patterns doctors look for when Wilson disease is suspected.
This is a standard blood draw with no special preparation tied to the copper test itself. If it's combined with other tests on the same visit, check whether any of those have their own requirements.
Most of the copper in your blood is carried by ceruloplasmin, a protein made in the liver. Reading the two together gives a clearer picture of how your body is handling copper than either test alone.
It can point to a diet low in copper-rich foods, a condition affecting absorption in the gut, or, less commonly, excessive zinc supplement use over time, since zinc competes with copper for absorption.
It's a rare inherited condition that stops the body clearing excess copper normally, so copper builds up in organs like the liver and brain. Copper and ceruloplasmin testing are part of how it's investigated.
Yes. Copper works alongside iron in forming red blood cells, so a significant deficiency can contribute to anaemia that doesn't fully explain itself through iron or B12 testing alone.
This page is general information about the test, not medical advice. Your own report's reference ranges apply — please discuss your results with your doctor.
No special preparation applies to the copper test on its own. If it's ordered with other tests, check whether any of those need fasting.
Not usually. It's ordered when there's a specific reason to suspect a copper deficiency or overload, rather than as part of standard screening panels.