Vitamins and nutrition . Patient guide
Zinc Blood Test
What is Zinc
Zinc is an essential trace mineral that acts as a cofactor for over 300 enzymes including those that regulate hormone production, immune response, wound healing, and the hair growth cycle. Serum zinc is the most widely used measure of zinc status.
This biomarker entry is being clinically reviewed by our team. The factual content draws on UK guidance (NICE, NHS, Royal Colleges and the relevant speciality society where cited).
Reference range
Reported in µmol/L (also seen as µg/dL (divide µmol/L by 0.153)). Final reports always carry the issuing laboratory's range, which is what your clinician will interpret against.
| Group | Range | Note |
|---|---|---|
| Adults (serum) | 11 to 22 | µmol/L; varies between UK labs |
| Borderline / deficient | 9 to 11 | |
| Deficient | under 9 |
What it is
Zinc is obtained from red meat, shellfish, seeds, nuts, and pulses. The body has no large storage pool, so status depends on regular intake. Inside cells zinc is a structural component of enzymes including superoxide dismutase and alcohol dehydrogenase, and in-vitro studies suggest it can modulate 5-alpha-reductase activity, which is one reason zinc status is often looked at alongside androgen markers.
Why a clinician would order it
Zinc is checked in hair shedding (particularly diffuse loss without clear hormonal cause), poor wound healing, recurrent infections, loss of taste or smell, suspected low testosterone in men, persistent fatigue, and as part of a comprehensive hair and hormone work-up. Vegetarian and vegan patients are at particular risk because plant-source zinc has lower bioavailability.
If your level is outside the range
Symptoms of low Zinc
- Hair shedding (diffuse pattern)
- Brittle or slow-growing nails
- Poor wound healing
- Recurrent colds or infections
- Reduced taste or smell
- Skin rashes, acne
- Low libido
- Slow growth in children
What low can indicate. Inadequate intake (vegetarian or vegan diet, restrictive eating), malabsorption (coeliac, IBD), high alcohol intake, certain medications (proton pump inhibitors reduce absorption), or increased demand (pregnancy, recovery from illness, intense training).
Symptoms of high Zinc
- Nausea, abdominal cramps (high-dose supplementation)
- Suppressed copper levels with long-term high-dose use
What high can indicate. Recent high-dose zinc supplementation (over 40 mg daily long-term can cause this). Sustained high zinc can drive copper deficiency, so high results should prompt review of supplementation.
Testing tips
Morning blood draw preferred. Avoid zinc supplements for 24 hours before testing. Acute illness or recent surgery transiently lowers serum zinc through redistribution, so retest after 4 to 6 weeks if a borderline-low result is found in that context. Zinc and copper move inversely, so check both if supplementation is planned.
Where you can get this tested
Zinc is included in the following WMG Health panels. Same-day appointments at our Harley Street clinic, with results clinician-reviewed.
Want a specific combination of markers we do not have a panel for? Build a custom panel and our clinicians will design one for you.
Symptoms often investigated with Zinc
Zinc is commonly tested when patients present with the following symptoms. If any of these resonate with you, the linked guides explain what to look for and which test pathway is appropriate.
Sources
UK guidance our clinicians use when interpreting this marker.
This page is general patient information, not personal medical advice. A GMC-registered clinician will review your results and tailor any interpretation to you. See our Editorial Policy for how we write and review content.
Common questions about Zinc
What is a normal Zinc range?
Adults (serum): 11 to 22 (µmol/L; varies between UK labs). Borderline / deficient: 9 to 11. Deficient: under 9. Always interpret your own results against the laboratory range printed on your report, since assay-specific reference ranges vary.
What does a low Zinc result mean?
Inadequate intake (vegetarian or vegan diet, restrictive eating), malabsorption (coeliac, IBD), high alcohol intake, certain medications (proton pump inhibitors reduce absorption), or increased demand (pregnancy, recovery from illness, intense training).
What does a high Zinc result mean?
Recent high-dose zinc supplementation (over 40 mg daily long-term can cause this). Sustained high zinc can drive copper deficiency, so high results should prompt review of supplementation.
Do I need to fast or prepare for the Zinc blood test?
Morning blood draw preferred. Avoid zinc supplements for 24 hours before testing. Acute illness or recent surgery transiently lowers serum zinc through redistribution, so retest after 4 to 6 weeks if a borderline-low result is found in that context. Zinc and copper move inversely, so check both if supplementation is planned.
Can I order a Zinc blood test privately in London?
Yes. WMG Health offers Zinc as part of bespoke panels and several pre-built panels at our 134 Harley Street clinic. Results are clinician-reviewed by a GMC-registered doctor within 4 hours for the most common assays. All panels are custom-built around your specific question; bookings via /contact/ or 020 3239 3378.