Skip to content

Serum or Plasma Substance Concentration (Bromocresol Green Immunoassay)

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

This test measures the level of a specific substance in your blood using a bromocresol green-based immunoassay. It helps assess the presence or concentration of certain proteins, antibodies, or other biomarkers.

Quick summary

["This test may be used to detect or monitor conditions affecting protein levels in your bloodstream."]

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

Key facts at a glance

LOINC
63389-1
Short code
ENA Ab CSF IA-aCnc
Synonyms
ENA Ab CSF IA-aCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What This Test Measures

The test detects and quantifies a particular substance in your serum or plasma using a specialized immunoassay method. Bromocresol green is often used as a colorimetric indicator to help identify and measure the concentration of the target analyte. This method is sensitive and precise for detecting low to moderate levels of substances like proteins, hormones, or antibodies.

Why It Might Be Ordered

Your healthcare provider may order this test to diagnose or monitor conditions such as protein-related disorders, immune system issues, or to evaluate the effectiveness of certain treatments. It can also be part of a broader screening or diagnostic panel.

Common Uses and Conditions

Common conditions where this test might be used include evaluating protein synthesis or degradation, checking for autoimmune diseases, or assessing liver or kidney function indirectly by measuring specific protein markers.

Sample Collection and Preparation

A blood sample is drawn from a vein, typically in the arm. The blood is then separated into serum (liquid after clotting) or plasma (liquid before clotting) for testing. This sample is sent to a laboratory for analysis using the immunoassay method.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

BCG Immunoassay (Substance Concentration)

Frequently asked questions

How long will it take to get my results?
Results from this test are usually available within 24 to 72 hours, depending on the laboratory’s workflow and your healthcare provider’s request. Follow-up instructions will be provided by your provider once results are ready.
What do abnormal results mean?
Abnormal results can indicate underlying health issues, such as abnormal protein levels that may suggest conditions like protein-losing syndromes, liver disease, or certain infections. Your healthcare provider will interpret the results in the context of your medical history and symptoms to determine the next steps.
Can I eat or drink anything before this test?
For most blood tests, including this one, you can typically eat and drink as usual unless your healthcare provider specifies otherwise. However, fasting may be required for some tests, so always follow any specific instructions provided by your provider.
  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