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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.

Quick summary

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

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

Key facts at a glance

LOINC
40947-4
Short code
Zinc Hair Ql
Synonyms
Zinc Hair Ql
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 Is This Test Done?

Your healthcare provider may order this test to check for zinc deficiency, especially if you have symptoms like frequent infections, hair loss, or slow wound healing. It can also help diagnose conditions like acrodermatitis enteropathica or evaluate nutritional status in certain groups.

What to Expect Before the Test

No special preparation is needed, but you may fast for 8–12 hours before the draw if instructed. Bring a list of medications to your appointment.

How the Test Works

A blood sample is taken from a vein in your arm. The sample is sent to a lab where zinc levels are measured using a specialized analytical method.

Possible Results & Next Steps

Results are compared to a reference range, but exact values depend on lab methods. Low zinc may prompt further testing or dietary advice; high levels could signal kidney issues or supplements.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Zinc Level

Frequently asked questions

What might low zinc levels suggest?
Chronic zinc deficiency can weaken immunity, impair growth in children, or cause neurological symptoms. It may also be linked to certain autoimmune or digestive disorders.
What might high zinc levels suggest?
Elevated zinc can result from kidney disease, excessive supplements, or rare genetic disorders. It may also mask copper deficiencies, which can cause its own health risks.
How often should I get this test?
Your provider will determine frequency based on your symptoms, medical history, or treatment plan. Routine adults rarely need it unless at risk for deficiency.
  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