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Serum or plasma concentration of zinc

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of zinc, a mineral essential for many bodily functions, in your blood.

Quick summary

["Zinc helps support immune function, wound healing, and metabolism—low levels may indicate health concerns."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
51875-3
Short code
VZIg Gvn BPU
Synonyms
VZIg Gvn BPU
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order a zinc test to check for deficiencies (e.g., due to poor diet, malabsorption, or chronic illness) or to evaluate symptoms like frequent infections, hair loss, or delayed wound healing. It can also help diagnose conditions like acrodermatitis enteropathica or certain metabolic disorders.

What to Expect During the Test

A blood sample is taken from a vein in your arm. You may feel a slight pinch, but it usually takes only a few minutes. No special preparation is needed unless instructed otherwise.

Possible Causes of Low or High Zinc Levels

Low zinc levels might be linked to diet, gastrointestinal issues (e.g., celiac disease), or certain medications. High levels could result from rare genetic disorders or excessive intake (e.g., supplements). Your doctor will consider your overall health and symptoms when interpreting results.

Common Symptoms to Watch For

Symptoms of zinc deficiency may include weakened immunity, skin rashes, hair loss, or delayed growth in children. High zinc levels rarely cause noticeable symptoms but may affect copper metabolism.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Zinc Level

Frequently asked questions

What if my zinc level is too low?
If your test shows low zinc, your doctor may recommend dietary changes (e.g., eating more shellfish, nuts, or seeds) or supplements under supervision. They’ll also check for underlying conditions like malabsorption.
Does zinc testing require fasting?
No fasting is typically required for this test, but follow your doctor’s instructions if they specify any preparation. Blood is drawn at a time that works best for you.
How long does it take to get results?
Results are usually available within 1–3 business days, depending on your lab. Your doctor will discuss them with you during your follow-up visit.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy