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Serum or Plasma Bromocresol Green Protein Binding Index (BCG Protein Binding Index)

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

This test measures how well certain proteins in your blood bind to a specific dye called bromocresol green. It helps assess liver function and protein synthesis.

Quick summary

["This test evaluates liver health and protein balance in your bloodstream."]

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

Key facts at a glance

LOINC
7128-2
Short code
Green Bean BasoBnd Ab Qn
Synonyms
Green Bean 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

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like jaundice (yellowing of skin/eyes), unexplained weight loss, fatigue, or if they suspect liver disease, malnutrition, or other conditions affecting protein production. It can also be used to monitor liver function during treatment for conditions like cirrhosis or hepatitis.

How the Test Works

A small blood sample is drawn, and the dye bromocresol green is added. The test measures how much of the dye binds to proteins in your serum or plasma. Lower binding levels may indicate liver dysfunction or protein deficiencies.

Sample Collection

Blood is collected from a vein, usually in your arm, using a needle. You may feel a small pinch, but it usually doesn’t cause discomfort. The test uses either serum (blood without clotting factors) or plasma (blood with clotting factors).

Preparation

No special preparation is needed, but inform your provider about any medications, supplements, or recent illnesses that could affect results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

BCG Protein Binding Test

Frequently asked questions

What Does a Low or High Result Mean?
A lower-than-expected result may suggest liver problems, malnutrition, or conditions that reduce protein production. A higher-than-expected result is less common but could indicate certain liver diseases or specific protein disorders.
How Long Does It Take to Get Results?
Results are typically available within 1–3 business days, depending on your lab’s processing time.
Can I Eat or Drink Before the Test?
You can eat and drink normally as there are no restrictions, but avoid alcohol 24 hours before the test if your provider recommends it.
  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