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Serum or plasma substance concentration (unspecified analyte) measured by immunoassay

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

This test detects a specific protein or substance in your blood, typically measured in serum or plasma using a sensitive immunoassay method.

Quick summary

["This test helps identify certain proteins or substances that may indicate health conditions or responses to treatments."]

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

Key facts at a glance

LOINC
79319-0
Short code
L2HG Amn-sCnc
Synonyms
L2HG Amn-sCnc
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

What This Test Measures

This test measures the concentration of a particular substance (such as an antibody, hormone, or enzyme) in your blood. The immunoassay method detects and quantifies this substance with high accuracy. The result helps healthcare providers assess your health status or diagnose conditions related to abnormal levels of this substance.

Why It’s Done

Doctors may order this test to diagnose or monitor conditions like infections, autoimmune diseases, hormone imbalances, or certain cancers. It can also help evaluate responses to treatments or screen for specific markers in research or clinical studies.

Common Uses

Common reasons for this test include detecting markers for autoimmune disorders, monitoring immune responses, evaluating endocrine function, or screening for genetic or metabolic conditions. It may also be used in specialized diagnostic procedures.

Sample Collection and Preparation

Blood is drawn from a vein in your arm, and the sample is processed into either serum (after clotting) or plasma (using an anticoagulant). The test uses this blood sample to measure the substance concentration accurately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

How might my results affect my care?
Your results will be reviewed by your healthcare provider to determine if they are within expected ranges or if they suggest an underlying condition. Elevated or low levels may prompt further testing or adjustments to treatment plans.
What could cause abnormal results?
Abnormal results may be due to underlying health conditions, medications, infections, or other physiological factors. For example, certain autoimmune diseases or chronic illnesses might lead to elevated or decreased levels of the measured substance.
How soon will I get my results?
Results are typically available within a few days to a couple of weeks, depending on the lab’s processing time and your healthcare provider’s workflow. Your provider will discuss the results with you during your follow-up visit.
  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