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Zinc in Serum (Mass Concentration)

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

This test measures the amount of zinc, a mineral essential for many bodily functions, present in your blood serum. Zinc helps support immune function, wound healing, and proper taste and smell.

Quick summary

["Zinc levels can help assess nutritional status and identify potential deficiencies or excesses."]

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

Key facts at a glance

LOINC
10918-1
Short code
Zinc Spec-mCnc
Synonyms
Zinc Spec-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 Is This Test Done?

Doctors may order a serum zinc test to check for zinc deficiency, which can occur due to poor diet, certain medical conditions, or malabsorption issues. It may also be used to monitor zinc levels in people taking zinc supplements or those with chronic illnesses like kidney disease or HIV.

What Does a Low or High Zinc Level Mean?

Low zinc levels might indicate malnutrition, gastrointestinal disorders, or conditions like diabetes or liver disease. High zinc levels could suggest zinc poisoning (rare) or certain medications. Your healthcare provider will interpret results in the context of your overall health and symptoms.

Common Reasons for Testing

This test is often performed when symptoms like frequent infections, slow wound healing, hair loss, or changes in taste and smell are present. It may also be part of routine blood work for patients with chronic conditions or those receiving zinc supplements.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if instructed. Wear comfortable clothing and plan to stay near the testing site for a short time while a blood sample is drawn.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Zinc Level

Frequently asked questions

What does a normal zinc level mean for my health?
A normal zinc level doesn’t guarantee you’re healthy, but it suggests your body is absorbing zinc properly. Your doctor will consider your symptoms, diet, and overall health to determine if further action is needed.
Can diet affect my zinc test results?
Yes, zinc absorption can be influenced by diet. High intake of zinc supplements or certain foods (like excessive fiber or phytates) may temporarily lower blood zinc levels. Your doctor may recommend dietary adjustments if needed.
How often should I get this test?
Your doctor will decide how often to test based on your health status, symptoms, and medical history. Regular tests may be recommended for people with chronic conditions or those taking zinc supplements.
  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