Copper · low result
What does a low Copper mean?
Short answer
Low copper is under-recognized and increasingly seen after bariatric surgery and with long-term high-dose zinc supplements (including denture creams), which block copper absorption. Malabsorption, malnutrition, prolonged tube feeding, and Menkes disease in infants are other causes. Deficiency produces anemia and low neutrophils that don't respond to iron, and a slowly progressive nerve and spinal-cord problem that mimics B12 deficiency — reversible if caught early.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
When does this result need same-day care?
- Low copper with progressive leg weakness, unsteady walking or loss of sensation — prompt evaluation; nerve damage becomes permanent if untreated
What is the normal range for Copper?
- Male, age 18+: 70.0 – 140 mcg/dL
- Female, age 18+: 80.0 – 155 mcg/dL
Can reflect malabsorption, gastric bypass, or excess zinc supplementation.
Full reference table, citations and testing options: Copper biomarker page.
What are the common causes of low Copper?
- High-dose zinc supplements or lozenges over months, zinc-containing denture cream
- Bariatric surgery (gastric bypass, duodenal switch), celiac disease, short bowel
- Malnutrition, prolonged parenteral or enteral nutrition without copper
- Nephrotic syndrome, excess iron supplementation
- Wilson disease (low ceruloplasmin, low total copper — but copper overload in tissues)
- Menkes disease (infants, rare)
What symptoms go with low Copper?
- Fatigue, pallor, frequent infections (anemia and neutropenia)
- Numbness and tingling, unsteady gait, weakness in the legs — the myeloneuropathy that resembles B12 deficiency
- Premature gray hair, brittle bones
What do clinicians usually check next?
- Ceruloplasmin, CBC with differential, zinc, B12
- Stop excess zinc; review surgical and nutritional history
- Neurology review if nerve symptoms are present; copper repletion is directed by a clinician
- 24-hour urine copper and liver panel if Wilson disease is possible (young adults with liver or neurological signs)
Follow-up tests available at TestWell: CBC with Differential ($21.99), CBC (Complete Blood Count) ($21.99), Zinc ($26.99).
How do you recheck Copper?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| Vitamin & Mineral Deficiency Panel | Panel · 9 tests | $189.99 | No | 3–5 business days |
| Men's Hair Health Panel | Panel · 19 tests | $499.99 | No | 4–7 business days |
| Women's Hair Health Panel | Panel · 19 tests | $469.99 | No | 4–7 business days |
| Copper | Test | $31.99 | No | 3–5 business days |
Common questions
How does zinc cause copper deficiency?
Zinc induces a gut protein (metallothionein) that traps copper in intestinal cells, so it is excreted rather than absorbed. Months of 40+ mg/day of zinc — common with immune-support dosing — is enough.
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.