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Zinc, Serum or Plasma Concentration

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."]

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

Key facts at a glance

LOINC
14955-9
Short code
Zinc SerPl-sCnc
Synonyms
Zinc SerPl-sCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Might You Need This Test?

Your healthcare provider may order this test to check for zinc deficiency, which can occur due to poor diet, certain medical conditions, or after certain treatments. It may also be used to monitor zinc levels in people with chronic illnesses or those taking medications that affect zinc absorption.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if your blood is drawn early in the morning. Bring a list of medications to your appointment, as some can affect results.

What Happens During the Test?

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. The blood sample will be sent to a lab for analysis.

What Are Common Causes of Low or High Zinc Levels?

Low zinc levels may be linked to dietary deficiencies, gastrointestinal disorders (like Crohn’s disease), chronic illnesses (such as diabetes or kidney disease), or certain medications. High levels can sometimes result from zinc toxicity, rare genetic conditions, or excessive intake.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Zinc Level

Frequently asked questions

Could low zinc levels affect my health?
Yes, zinc deficiency can weaken your immune system, slow wound healing, cause hair loss, and increase the risk of infections. It may also affect taste, appetite, and cognitive function. Your provider will interpret results in the context of your overall health.
What if my zinc level is outside the expected range?
If your results are low, your provider may recommend dietary changes, supplements, or further testing to identify the cause. If high, they may investigate potential causes like medication interactions or rare conditions.
Does this test require fasting?
Sometimes, but not always. Your provider will let you know if fasting is needed, as it can affect results. Follow their instructions to ensure accurate results.
  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