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Bromocresol Purple Protein Electrophoresis (Serum/Plasma)

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

This test measures protein distribution in your blood using a technique called electrophoresis with the Bromocresol Purple dye. It helps assess the balance of different protein fractions, which can indicate potential abnormalities in your immune system, liver function, or other conditions.

Quick summary

["This test helps identify protein imbalances that may signal underlying health concerns."]

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

Key facts at a glance

LOINC
26466-3
Short code
WBC # Fld
Synonyms
WBC # Fld
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
4.5
Ref high
11
Critical range
2 N/A – 30 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85004
SNOMED
900000000000003002
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

Electrophoresis separates blood proteins based on their size and electrical charge. The Bromocresol Purple dye binds to specific protein groups, allowing for visual differentiation of albumin, alpha, beta, and gamma globulins. This helps evaluate the overall protein profile in your serum or plasma.

How the Test Works

A small blood sample is drawn and placed in a gel medium. An electric current is applied, causing proteins to migrate toward the positive electrode. The dye highlights different protein bands, which are then analyzed for concentration and distribution.

Why It’s Done

This test is often used to diagnose or monitor conditions like chronic inflammation, autoimmune diseases, liver or kidney disorders, or certain types of anemia. It may also be part of a broader evaluation for unexplained symptoms or suspected protein abnormalities.

Common Uses and Conditions

Protein electrophoresis with Bromocresol Purple is particularly useful for detecting abnormal protein patterns, such as those seen in multiple myeloma, Waldenström macroglobulinemia, or other monoclonal gammopathies. It can also help assess albumin levels and globulin fractions in conditions affecting protein synthesis or breakdown.

Reference range

Adult: 4.5-11.0 x 10^9/LN/A

Specimen: serum

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

BCP Protein Electrophoresis

Frequently asked questions

What might cause this test to be ordered?
Your healthcare provider may order this test if you have symptoms like fatigue, unexplained weight loss, swollen lymph nodes, or signs of organ dysfunction. It may also be part of routine monitoring for conditions like rheumatoid arthritis, lupus, or liver disease.
How long will it take to get results?
Results are typically available within 24 to 48 hours, depending on your lab’s processing time. Your healthcare provider will discuss the findings with you during your follow-up visit.
Can I eat or drink before this test?
No special preparation is usually needed for this test, but you may be asked to fast if your blood is drawn in the morning. Follow your healthcare provider’s instructions for any specific guidelines related to your situation.
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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