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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 substance in your blood, measured using an immunoassay method. It helps identify levels of certain proteins, hormones, or other molecules that may be important for diagnosing or monitoring health conditions.

Quick summary

["This test can help diagnose or track conditions related to abnormal blood chemistry or immune function."]

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

Key facts at a glance

LOINC
80174-6
Short code
SAH CSF-sCnc
Synonyms
SAH CSF-sCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What This Test Measures

An immunoassay is a sensitive lab test that uses antibodies to detect and measure specific substances in your blood. This test identifies the presence and concentration of a particular analyte (the exact substance isn’t specified here). Immunoassays are commonly used for hormones, proteins, drugs, or other biomarkers that play roles in health and disease.

Why It Might Be Ordered

Your healthcare provider may order this test to check for conditions like infections, autoimmune diseases, hormonal imbalances, or to monitor treatment responses. For example, it could be used to detect markers of inflammation, certain cancers, or metabolic disorders.

Common Uses and Conditions

This test may be used in screening, confirmation, or monitoring scenarios where precise substance levels are critical. It’s often paired with other tests to provide a fuller picture of your health.

Sample Collection and Preparation

A blood sample is drawn from a vein, typically in your arm. The blood is then processed into either serum (after clotting) or plasma (after centrifugation). The specimen is sent to a lab where the immunoassay detects and quantifies the analyte.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

What does an abnormal result mean?
An abnormal result could indicate an underlying health issue, such as an infection, autoimmune activity, or a metabolic disorder. However, results alone don’t diagnose a condition—they’re part of a larger clinical picture. Your provider will interpret results in the context of your symptoms and medical history.
How often should I get this test?
Frequency depends on your health status and treatment plan. Some tests are routine (e.g., annual check-ups), while others are ordered as needed (e.g., before surgery or during symptom monitoring). Follow your provider’s instructions.
Can I prepare for this test?
Minimal preparation is usually needed. Avoid heavy meals or certain medications (if instructed) 24 hours before the draw to ensure accurate results. Rest assured—your sample is handled with care to prevent contamination or error.
  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