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Serum or Plasma Substance Concentration by Immunoassay (Bromocresol Green)

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

This test measures a specific protein or substance in your blood using a bromocresol green-based immunoassay method. It helps evaluate conditions affecting protein levels or certain metabolic functions.

Quick summary

["This test assesses protein or substance levels that may indicate health risks or help diagnose underlying conditions."]

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

Key facts at a glance

LOINC
7549-9
Short code
Onion BasoBnd Ab Qn
Synonyms
Onion BasoBnd Ab Qn
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
lhr
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What This Test Measures

The test detects the presence and concentration of a particular substance (often a protein or enzyme) in your serum or plasma. Bromocresol green is used to visually assess binding interactions, which helps quantify the target analyte.

Why It’s Done

Doctors may order this test to check for conditions like protein disorders, liver function issues, or to monitor treatments affecting protein metabolism. It can also screen for certain metabolic or genetic disorders.

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 after centrifugation), depending on the test requirements. This sample is sent to a lab for processing.

Common Uses and Conditions

This test is often used in research or specialized clinical settings to evaluate protein profiles, monitor chronic conditions, or confirm diagnoses related to protein abnormalities. It may also be part of broader metabolic or genetic testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

BCG Immunoassay (Serum/Plasma)

Frequently asked questions

Why might my doctor request this test?
Your doctor may order this test if they suspect a condition affecting protein metabolism, such as liver disease, kidney problems, or certain genetic disorders. It could also be part of a broader diagnostic workup for unexplained symptoms or monitoring a known condition.
How long will it take to get results?
Results are typically available within 1 to 3 business days, depending on lab processing times and whether additional confirmatory testing is needed. Follow-up with your healthcare provider is recommended for interpretation.
What should I do if I have concerns about my results?
If you receive abnormal results, discuss them with your healthcare provider. They will explain what the findings mean in the context of your health and may recommend further testing or adjustments to your treatment plan.
  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