Zinc levels: what's normal, high and low
An essential trace mineral important for immune function, wound healing, and taste/smell.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
The short answer
Zinc is measured with a standard blood draw after an 8–12 hour fast. A typical reference range is 60.0 – 130 mcg/dL. At TestWell it's $26.99 all-in as Zinc, results in 3–6 business days, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis.
- Units
- mcg/dL / ug/dL
- Sample
- Blood draw
- Fasting
- 8–12 hours
- Results
- 3–6 business days
- Price
- $26.99
- Labs
- Quest or Labcorp · BioReference in NY/NJ
Zinc Reference Range
These are the typical adult reference ranges used by major US labs. Your report will include the specific range used by the lab that processed your sample.
| Population | Range |
|---|---|
| age 18+ | 60.0 – 130 mcg/dL |
Reference ranges are educational. Always interpret your result with the specific range printed on your lab report and discuss anything outside the range with a clinician.
Have a result in hand? analyze it with your AI assistant using these reviewed ranges, or run it through our explainer. Tools: look up another marker's range · convert lab units
What your Zinc result may mean
Can reflect inadequate intake (vegetarian diets), malabsorption, or chronic illness.
What a low Zinc means: causes, symptoms, next steps ↓Educational only — not a diagnosis. Many factors can influence a single result. Discuss anything that concerns you with a healthcare provider.
What does a high Zinc mean?
High zinc is nearly always supplement-driven — zinc lozenges, immune formulas and high-dose tablets — and matters mainly because sustained excess (above about 40 mg/day) suppresses copper absorption, causing anemia, low neutrophils and, over time, nerve damage. Hemolyzed samples and some tube types also read falsely high.
Common causes of a high Zinc
- Zinc supplements and lozenges, 'immune' formulas, denture creams
- Occupational exposure (welding, galvanizing)
- Sample hemolysis or contaminated collection tubes (false high)
Ordered from most to least common.
Symptoms that can go with it
- Nausea, stomach upset, metallic taste
- Over time: fatigue, anemia and neurological symptoms from copper deficiency
What clinicians usually check next
- Stop supplements and retest
- Copper and ceruloplasmin, CBC if intake has been high for months
Follow-up tests at TestWell: CBC with Differential ($21.99), Copper ($31.99), Ceruloplasmin ($29.99).
How much zinc is too much?
The adult upper limit is 40 mg/day. Many lozenge regimens exceed it during a cold — fine for a few days, a problem over months.
Educational only — not a diagnosis. A single result outside the range is a prompt to look closer with a clinician.
What does a low Zinc mean?
Low zinc is most often a dietary or absorption problem — vegetarian and vegan diets, low protein intake, alcohol use, inflammatory bowel disease, bariatric surgery, chronic diarrhea, liver or kidney disease — and drops transiently during any acute illness because zinc shifts into tissues. It shows up as slow wound healing, hair loss, taste changes and frequent infections.
Common causes of a low Zinc
- Low intake: vegetarian/vegan or low-protein diets, restricted eating
- Malabsorption: inflammatory bowel disease, celiac disease, bariatric surgery
- Alcohol use disorder, liver disease, kidney disease
- Acute infection or inflammation (temporary shift out of the blood)
- Pregnancy and breastfeeding, diuretics, high-dose iron supplements
Ordered from most to least common.
Symptoms that can go with it
- Slow wound healing, frequent infections
- Hair shedding, brittle nails, skin rash around the mouth
- Reduced sense of taste or smell, poor appetite
What clinicians usually check next
- Repeat when well — infection lowers serum zinc without deficiency
- Albumin and CRP (zinc is protein-bound and drops with inflammation)
- Copper if supplementing zinc long-term (zinc lowers copper)
Follow-up tests at TestWell: C-Reactive Protein (CRP) ($26.99), Copper ($31.99).
Is serum zinc a reliable test?
It's the standard but imperfect: it falls with infection and low albumin and varies with meals. A fasting morning draw when you're well is the most interpretable.
Educational only — not a diagnosis. A single result outside the range is a prompt to look closer with a clinician.
How do you get a Zinc test?
Order online, a licensed physician reviews the requisition, and you walk into a nearby lab for the draw. Zinc is available on its own or inside these panels — panels cost less per marker when you want the fuller picture.
| Option | Includes | Price |
|---|---|---|
| Zinc | This marker only | $26.99 |
| Vitamin & Mineral Deficiency Panel | 9 tests | $189.99 |
| Total Body Essentials Panel | 39 tests | $399.99 |
| Women's Hair Health Panel | 19 tests | $469.99 |
| Men's Hair Health Panel | 19 tests | $499.99 |
Quest vs. Labcorp for Zinc: which lab should you pick?
Both are CLIA-certified national labs and the result is clinically equivalent, so pick whichever location is closer. Your report will print that lab's own reference range, which can differ slightly from the table above.
| Lab | Available | Price |
|---|---|---|
| Quest Diagnostics | Yes | $26.99 |
| Labcorp | Yes | $26.99 |
| BioReference (NY & NJ) | Yes | $22.99 |
Need help choosing a location? Use the lab finder to see draw sites near your ZIP.
Frequently asked
What does a high Zinc mean?
High zinc is nearly always supplement-driven — zinc lozenges, immune formulas and high-dose tablets — and matters mainly because sustained excess (above about 40 mg/day) suppresses copper absorption, causing anemia, low neutrophils and, over time, nerve damage. Hemolyzed samples and some tube types also read falsely high.
How much zinc is too much?
The adult upper limit is 40 mg/day. Many lozenge regimens exceed it during a cold — fine for a few days, a problem over months.
What does a low Zinc mean?
Low zinc is most often a dietary or absorption problem — vegetarian and vegan diets, low protein intake, alcohol use, inflammatory bowel disease, bariatric surgery, chronic diarrhea, liver or kidney disease — and drops transiently during any acute illness because zinc shifts into tissues. It shows up as slow wound healing, hair loss, taste changes and frequent infections.
Is serum zinc a reliable test?
It's the standard but imperfect: it falls with infection and low albumin and varies with meals. A fasting morning draw when you're well is the most interpretable.
Do I need a doctor's order to test my zinc?
No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor.
How long does it take to get Zinc results?
Most Zinc results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment your results are ready, with everything viewable in your TestWell portal.
How much does a Zinc test cost?
Our Zinc starts at $26.99. That's the all-in price — no copays, no insurance hoops, no surprise bills. HSA and FSA cards are accepted.
Do I need to fast before my Zinc test?
Yes — for the most accurate result, fast for 8–12 hours before your blood draw. Water is fine; coffee, food, and supplements are not. Your prep instructions will be included with your order.
Which lab will process my Zinc test?
Your test will be processed by Quest Diagnostics, Labcorp, or BioReference depending on which is closest to you and which lab carries the test. All three are CLIA-certified and trusted by hospitals nationwide. You'll choose your lab during checkout from 4,000+ locations.
Ready to test your zinc?
Order in two minutes, get physician-approved, and visit a lab the same day. Starts at $26.99.