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Serum or Plasma Slope of Electrophoresis (Qualitative Protein Zone Analysis)

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

This test measures the slope of protein bands during electrophoresis, a method used to assess protein distribution in serum or plasma. It helps identify patterns in protein separation that may indicate conditions affecting protein synthesis, breakdown, or transport.

Quick summary

["This test helps diagnose or monitor conditions linked to abnormal protein patterns in your blood."]

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

Key facts at a glance

LOINC
10103-0
Short code
ST Slope L-V4
Synonyms
ST Slope L-V4
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ekg
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 proteins in your blood based on size and charge. The slope of the resulting bands reflects how proteins distribute across different zones. A steeper slope may suggest certain protein abnormalities, while a flatter slope could indicate others.

Common Uses

This test is primarily used in specialized settings to evaluate conditions like: - Chronic liver disease (e.g., cirrhosis) - Certain autoimmune disorders - Protein metabolic disorders - Monitoring treatment responses in rare genetic conditions affecting protein synthesis.

How the Test Works

Blood is drawn and processed into serum or plasma. Proteins are separated using an electric field, creating distinct bands. The slope of these bands is analyzed to detect any unusual patterns or shifts in protein distribution.

Preparation for the Test

No special preparation is needed unless instructed by your healthcare provider. Avoid alcohol or certain medications that may affect protein levels for 24–48 hours before testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Electrophoresis Slope Test

Frequently asked questions

Why might my doctor order this test?
Your doctor may recommend this test if they suspect conditions affecting protein balance, such as liver disease, genetic disorders, or autoimmune conditions. It helps identify specific protein patterns that standard blood tests might miss.
What does a different slope mean?
A slope that deviates from normal can indicate: - Abnormal protein synthesis (e.g., in liver or kidney disease) - Increased breakdown of proteins (e.g., in muscle disorders) - Changes in protein transport (e.g., in autoimmune diseases). Results are interpreted by a specialist, often in conjunction with other tests.
Can this test replace other blood tests?
No, this test is specialized and used alongside other blood tests (e.g., liver function tests, albumin levels) to provide a more complete picture of protein health. Results are always reviewed by a healthcare provider.
  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