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Serum/plasma substance concentration (mass concentration) for a specific biomarker related to protein metabolism or liver function (e.g., bilirubin, ammonia, or a similar analyte)

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

This test measures the amount of a particular substance in your blood, often linked to how your liver or metabolism works.

Quick summary

["This test helps doctors check how well your body processes certain substances."]

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

Key facts at a glance

LOINC
79604-5
Short code
S-B-AIB SerPl-sCnc
Synonyms
S-B-AIB 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 This Test Might Be Ordered

Your healthcare provider may recommend this test if they suspect issues with your liver, kidney function, or protein metabolism. It could also be part of a routine check-up or monitoring for a known condition.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours before the blood draw if the test involves substances affected by food. Avoid alcohol for 24 hours before testing.

How the Test Is Performed

A healthcare professional will draw blood from a vein, typically in your arm. The blood sample will be sent to a lab for analysis. The test measures the concentration of a specific substance in your serum or plasma.

What the Results Mean

Results will be compared to standard reference ranges to determine if your levels are within normal limits or if further investigation is needed. Your doctor will discuss the results with you in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal results may indicate liver disease, metabolic disorders, or other conditions affecting protein or substance metabolism. High or low levels could signal potential health concerns that require further medical evaluation.

Frequently asked questions

How long does it take to get my test results?
Results are typically available within 1 to 3 business days, depending on lab processing times and your healthcare provider’s workflow. Your doctor will contact you once results are ready.
Can I eat or drink before this test?
Some tests may require fasting, but this test does not typically require fasting unless specified by your doctor. Always follow your provider’s instructions for the best accuracy.
What are common causes of abnormal results?
Abnormal results can be caused by liver disease, kidney problems, certain medications, infections, or metabolic disorders. If you have symptoms like fatigue, jaundice, or unexplained weight changes, discuss them with your doctor.
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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