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Zinc in Serum or Plasma (Mass 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. Zinc helps support immune function, wound healing, and metabolism.

Quick summary

["Zinc levels help assess nutritional status and potential deficiencies."]

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

Key facts at a glance

LOINC
6973-2
Short code
Deprecated Zinc Plas-mCnc
Synonyms
Deprecated Zinc Plas-mCnc
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 This Test Be Ordered?

Your healthcare provider may order this test if you have symptoms like frequent infections, slow wound healing, hair loss, or fatigue. It may also be checked in people with conditions like alcoholism, malabsorption disorders, or certain medications that affect zinc absorption.

What to Expect Before the Test

No special preparation is usually needed. You may fast before the test if it’s a blood draw, but always follow your provider’s instructions. Bring any medications or supplements you’re taking, as they could affect results.

How the Test Is Performed

A healthcare professional will draw blood from a vein in your arm. The blood sample is then sent to a lab for analysis. The test measures zinc concentration in your serum or plasma.

What the Results Mean

Results are compared to a reference range, but exact values can vary by lab. Low zinc levels may indicate deficiency, while high levels could suggest conditions like acute infection, liver disease, or certain medications.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Low zinc levels can weaken the immune system, impair wound healing, and cause neurological symptoms. High levels may signal infections, metabolic disorders, or drug interactions. Monitoring zinc levels helps diagnose and manage these conditions effectively.

Short name

Zinc Level

Frequently asked questions

How long does it take to get test results?
Results are typically available within 1–3 business days, depending on lab processing times. Follow up with your provider to discuss results and next steps.
Can I eat or drink before this test?
If fasting is required (e.g., for a blood draw), avoid food and liquids except water for 8–12 hours beforehand. If no fasting is needed, eat normally. Always confirm instructions with your provider.
What does a low zinc level mean?
A low zinc level may suggest malnutrition, poor absorption (e.g., from celiac disease or Crohn’s), chronic illness, or certain medications. Your provider will review symptoms and other test results to determine the cause and recommend treatment.
  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