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Red Blood Cell Fluid (or Plasma) Protein Electrophoresis

Published: August 9, 2026Updated: August 17, 2026

This test measures the distribution of proteins in your red blood cell fluid (or plasma) using electrophoresis, a method that separates proteins based on size and charge.

Quick summary

["Helps identify abnormal protein patterns that may signal conditions like blood disorders or metabolic issues."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
26455-6
Short code
RBC # Fld
Synonyms
RBC # Fld
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
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
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 splits proteins into bands, each representing different types (e.g., albumin, globulins). This helps detect imbalances that could indicate conditions like multiple myeloma, hereditary angioedema, or other protein-related disorders.

Why It’s Done

Your healthcare provider may order this test if you have symptoms like fatigue, swelling, or unexplained protein abnormalities in other blood tests. It’s also used to monitor certain inherited conditions or track treatment responses.

Common Uses

This test isn’t routinely part of standard blood work but is used in specialized cases, such as diagnosing hereditary disorders or evaluating protein metabolism.

Sample Collection

A blood sample is drawn from a vein, typically in your arm. The fluid (plasma or serum) is then processed to separate proteins for analysis.

Reference range

Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/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

None

Frequently asked questions

Why might I need this test?
Your doctor may recommend it if you have symptoms like unexplained swelling, fatigue, or if other blood tests suggest protein-related issues. It’s also used for diagnosing or monitoring certain inherited disorders.
What does the test involve?
A small blood sample is taken, and the fluid is analyzed to separate proteins. Results show bands representing different protein types, which can help identify abnormalities.
How long will results take?
Results are typically ready within 1–3 business days, depending on lab processing times.
  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 17, 2026. · Read our editorial policy