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Serum or Plasma Substance Concentration (Bromocresol Green Immunoassay)

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

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

Quick summary

["This test helps doctors monitor specific substances in your blood that may relate to health conditions or treatment responses."]

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

Key facts at a glance

LOINC
45179-9
Short code
HG IgG CF Ser Ql IF
Synonyms
HG IgG CF Ser Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
CPT
82784
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What This Test Measures

The test detects and quantifies a particular substance in your serum or plasma. The bromocresol green method helps identify and measure the concentration accurately. This test is often used to detect substances like hormones, enzymes, or proteins that may be elevated or low in certain health conditions.

Why It’s Done

Healthcare providers may order this test to diagnose or monitor conditions such as hormone imbalances, liver function, kidney function, or to check for certain infections or diseases. It can also be used in research or specialized clinical settings to track specific biomarkers.

Sample Collection and Preparation

A blood sample is typically collected from a vein in your arm. The blood is then processed to separate serum or plasma, which is sent to the lab for testing. This process usually takes a few minutes, and you may experience a brief pinch or slight discomfort during venipuncture.

Test Results and Interpretation

Results are expressed as a concentration value (e.g., mg/dL, nmol/L, or another unit depending on the analyte). Your results will be compared to a reference range provided by your healthcare provider to determine if your levels are within normal limits or if further evaluation is needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

BCG Immunoassay (Substance Concentration)

Frequently asked questions

What does this test measure?
This test measures the concentration of a specific substance in your blood using a specialized immunoassay method. The exact substance can vary, but it often includes proteins, hormones, or other biomarkers that may indicate underlying health conditions such as hormonal imbalances, liver or kidney disease, or other metabolic disorders.
How long will I need to prepare for this test?
No special preparation is usually required for this test. However, you may be asked to fast for certain substances (like glucose or lipids) if that is the analyte being tested. Always follow your healthcare provider’s instructions for any specific preparations.
What are the possible side effects of blood drawing?
Most people experience only minor discomfort or bruising at the injection site. Rarely, there may be a slight swelling or pain. If you experience excessive bleeding, dizziness, or signs of infection (like increased pain or redness), contact your healthcare provider immediately.
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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