Bromocresol Blue Protein Electrophoresis (Serum)
This test measures protein distribution in your blood using a technique called electrophoresis, which separates proteins based on size and charge. It helps assess conditions affecting protein balance, such as liver disease or kidney problems.
["This test helps doctors check how proteins are distributed in your blood, which can signal underlying health issues."]
Key facts at a glance
- LOINC
- 30392-5
- Short code
- nRBC # Bld
- Synonyms
- nRBC # Bld
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Ref low
- 4.2
- Ref high
- 5.9
- Critical range
- 2 N/A – 7 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 85041
- SNOMED
- 900000000000003001
- 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 Does This Test Measure?
The test uses an electric field to move proteins in your serum through a gel. Different proteins—like albumin and globulins—migrate at varying speeds, creating bands that reflect their concentration. Bromocresol Blue dye binds to proteins, allowing for visual separation.
Why Might Your Doctor Order This Test?
Your doctor may recommend this test if they suspect conditions like chronic liver disease, kidney disease, or certain autoimmune disorders. It can also help monitor protein-related conditions or evaluate treatment responses.
Common Conditions Monitored
Protein electrophoresis helps identify imbalances that could indicate liver dysfunction (e.g., cirrhosis), kidney disease (e.g., nephrotic syndrome), or abnormal protein production (e.g., multiple myeloma). It’s sometimes used alongside other tests to refine diagnoses.
Sample Collection and Preparation
A blood sample is drawn from a vein, typically in the arm. The serum (liquid part after clotting) is then separated and prepared for analysis. No special preparation is needed, but fasting may be advised depending on your doctor’s instructions.
Reference range
Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/LN/A
No special preparation required. Stay well hydrated.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
BCB Protein Electrophoresis
Frequently asked questions
How long does it take to get results from this test?
Can I eat or drink before this test?
What does an abnormal result mean?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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 17, 2026. · Read our editorial policy