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Selenium in Gastric Juice (Mass Concentration)

Published: August 9, 2026Updated: August 17, 2026

This test measures the amount of selenium present in your stomach acid (gastric juice). Selenium is an essential mineral that plays a role in metabolism and antioxidant defense, and low levels may affect digestion or overall health.

Quick summary

["Your stomach’s selenium levels help assess nutrient absorption and potential deficiencies."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
20960-1
Short code
Selenium Gast-mCnt
Synonyms
Selenium Gast-mCnt
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
10
Ref high
40
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84484
SNOMED
302774002
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 This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like chronic diarrhea, weight loss, or fatigue—especially if selenium deficiency is suspected. It may also be part of a broader evaluation for gastrointestinal disorders or malabsorption issues.

What to Expect Before the Test

You’ll likely fast for 8–12 hours before the test, as gastric juice is collected via a thin tube inserted through your nose into your stomach. The procedure is quick but may cause mild discomfort. No special preparation is needed beyond fasting.

How the Test Works

A small amount of your stomach acid is collected and sent to a lab for analysis. The test measures selenium concentration using a specialized method to detect its presence accurately.

What the Results Mean

Results are compared to a reference range for selenium in gastric juice, though exact values may vary by lab. Low levels may indicate malabsorption, dietary deficiencies, or underlying gastrointestinal conditions.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Gastric Selenium Level

Frequently asked questions

What does a low selenium level in gastric juice suggest?
Low levels may signal malabsorption of selenium, which could affect digestion, energy levels, or immune function. High levels are less commonly evaluated but may warrant further investigation for potential causes like certain medications or metabolic disorders.
What if my results are outside the normal range?
If your results are low, your doctor may recommend dietary changes, supplements, or additional tests to check for conditions like celiac disease or pancreatic insufficiency. If high, they may investigate potential lab errors or rare metabolic issues.
How often should I get this test?
This test is usually not routine but may be ordered periodically if you have ongoing symptoms or a history of gastrointestinal disorders. Follow your doctor’s guidance for follow-up testing.
  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 17, 2026. · Read our editorial policy