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Zinc and copper compete for absorption. Take one without monitoring the other and you risk displacing both. One test, complete picture.
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Measure your zinc and copper levels together to assess balance between these two competing trace minerals. Home fingerstick kit available.
Zinc and copper are often discussed individually, but their clinical significance is best understood in relation to each other. High-dose zinc supplementation reliably depletes copper by competing for absorption; conversely, elevated copper can suppress zinc status. This antagonism means that taking zinc alone without monitoring copper — a common practice among people seeking immune or hormonal support — can create a copper deficiency that causes anaemia, neurological problems, and joint pain. Conversely, elevated serum copper is associated with inflammatory conditions, oestrogen-dominant states, and certain connective tissue disorders. This two-marker panel gives you the data to manage both minerals intelligently. The zinc-to-copper ratio is calculated and reported alongside absolute values. All results are reviewed by a GMC-registered physician.
Understand what each marker measures, why it matters, and what the science says — not just a list of numbers.
This panel is designed for adults who want a comprehensive, evidence-based picture of their metabolic health — not a GP referral panel.
Anyone supplementing with zinc, particularly at doses above 15 mg daily
People investigating hair loss, poor wound healing, or recurrent infections
Women with high oestrogen or taking hormonal contraception (copper tends to rise)
Individuals with connective tissue conditions or joint symptoms
Practitioners monitoring patients on long-term supplementation regimens
Serum zinc is relatively insensitive to intracellular zinc status; a normal serum result does not exclude functional zinc deficiency in tissues. Serum zinc is also reduced non-specifically by inflammation, infection, and stress (as zinc redistributes intracellularly as part of the acute-phase response) and may be misleadingly low during illness. Serum copper, in contrast, rises during the acute-phase response and also increases significantly with oestrogen exposure (including oral contraceptive pill use and pregnancy). The zinc-to-copper ratio is a calculated value and should be interpreted alongside absolute levels and the clinical context. This panel does not include caeruloplasmin, which is required for a full copper assessment.
From order to physician-reviewed report in as little as three working days.
Home fingerstick or mobile phlebotomist at checkout.
8-hour fast reduces dietary variability in serum zinc.
Pre-paid Royal Mail envelope included.
Zinc, copper, and ratio with physician commentary in 3 to 5 working days.
Three options designed to fit your schedule, location, and preference — all producing a laboratory-standard sample.
Adults 18+ in mainland UK. Not suitable if you have had a transfusion in the last 3 months.
Order anytime; kit dispatched within 24 hours Mon–Fri.
Allow 24–48 hours for sample transit on top of lab processing time.
Adults 18+ within 20 miles of a serviced city centre.
Mon–Sun, 06:00–20:00. Next-day booking typical.
Sample reaches the lab within 24 hours of collection.
Adults 16+ with photo ID. Paediatric draws by appointment at selected sites.
Mon–Fri, with Saturday hours at most metropolitan locations.
Samples processed same-day at the receiving clinic.
Every test is processed in a UKAS ISO 15189-accredited laboratory, overseen by GMC-registered physicians, and governed by UK GDPR. No overseas processing, no offshore data.
Follow these guidelines to ensure accurate, reproducible results. Most markers are sensitive to recent food, exercise, and sleep.
Can't find your answer? Our clinical support team is available Monday to Friday, 9am–5pm.
Contact supportZinc and copper share the same intestinal absorption transporter (metallothionein). High zinc intake stimulates production of this protein in intestinal cells, which binds copper preferentially and prevents it entering the bloodstream. The copper is then lost when the intestinal cells are shed. At doses of 25 mg of elemental zinc per day or above, this effect becomes clinically significant. Many people supplementing zinc for immune support, testosterone, or skin health are unknowingly inducing copper deficiency over months or years.
Copper deficiency can cause a haematological picture indistinguishable from iron deficiency (anaemia with low white cell count), peripheral neuropathy, gait disturbances, and, in severe cases, myelopathy. Joint pain and laxity can occur due to impaired collagen cross-linking. Because the symptoms are non-specific and overlap with many other conditions, copper deficiency is frequently missed, particularly in people taking high-dose zinc for extended periods. A simple blood test resolves the uncertainty.
Oestrogen stimulates the liver to produce caeruloplasmin, a copper-carrying protein. This increases serum copper concentration. Women on combined oral contraceptives typically have copper levels in the upper half or above the reference range, which can produce symptoms sometimes described as ‘copper toxicity’ in functional medicine contexts — anxiety, joint pain, oestrogen sensitivity. Whether elevated copper in this setting is clinically harmful is debated; however, knowing your levels allows for an informed conversation with your GP or gynaecologist.
A zinc-to-copper ratio between 0.7 and 1.0 is generally considered optimal in most clinical references, though specific target ranges vary by laboratory and method. A ratio significantly above 1.0 suggests zinc excess or copper insufficiency; a ratio well below 0.7 suggests relative copper excess or zinc deficiency. The ratio is more clinically meaningful than either marker in isolation because it captures the functional balance between the two competing minerals.
Yes. Stop any zinc supplement for at least 48 hours before collection to avoid acutely elevated serum zinc that could misrepresent your steady-state level. For copper, continue any copper supplementation as normal; you want to know your true copper level under your current supplementation approach. After receiving your results, the physician commentary will advise whether your current supplementation is appropriate given the zinc and copper values and their ratio.
