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Serum Protein Electrophoresis (Free Zone Analysis)

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

This test measures the distribution of different protein types in your blood serum, focusing on the free (unbound) protein zones, particularly in the beta and alpha regions. It helps identify abnormalities in protein composition that may signal conditions like inflammation, infections, or certain blood disorders.

Quick summary

["This test helps diagnose and monitor conditions affecting protein balance in your blood."]

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

Key facts at a glance

LOINC
55899-9
Short code
UIFE
Synonyms
BJ Protein Free Ur Ql Elph
Category
chemistry
Sample
urine
Container
Sterile, leak-proof urine collection container; 24-hour urine container with preservative (toluene or thymol) if quantifying total urine protein; plain container acceptable for qualitative testing
Units
N/A
Ref low
7.35
Ref high
7.45
Critical range
7.2 N/A – 7.6 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
electrophoresis
CPT
86335
SNOMED
313071005
Specimen volume
Random urine: minimum 10 mL; 24-hour urine collection: complete collection preferred for quantification
Stability
Room temperature: 2 hours; Refrigerated (2-8°C): 7 days; Frozen (-20°C or below): 1 month. For immunofixation, refrigerate if testing within 7 days; freeze for longer storage.
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
24–72 hours
Order
routine

What This Test Measures

Electrophoresis separates proteins in your blood based on their size and electrical charge. The free zones—particularly the beta and alpha regions—are analyzed to detect variations in protein levels. This includes proteins like albumin, globulins, and other unbound proteins that may be elevated or reduced due to health issues.

Why It Matters in Your Health

Abnormal protein patterns can indicate underlying health problems, such as chronic inflammation, autoimmune diseases, or conditions affecting liver or kidney function. For example, certain protein shifts may signal infections, cancers, or metabolic disorders.

Common Uses and Indications

Your doctor may order this test if you have symptoms like fatigue, unexplained weight loss, swelling, or if they suspect conditions like multiple myeloma, lymphoma, or chronic liver disease. It’s also used as part of routine monitoring for patients with known protein-related disorders.

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm. The blood is processed to separate serum (the liquid part after clotting), which is then analyzed in a lab. No special preparation is needed, but fasting may be advised depending on your doctor’s instructions.

Reference range

NCBI: pH 7.35-7.45N/A

Specimen: urine

No fasting required. Patient should maintain normal hydration prior to specimen collection unless otherwise instructed. A 24-hour urine collection is preferred for quantification; random urine may be used for qualitative presence testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Protein Electrophoresis

Frequently asked questions

How long will it take to get my results?
Results are typically available within 24 to 48 hours, depending on your lab’s processing schedule. Your doctor will discuss the findings with you during your follow-up visit.
Can I eat or drink before this test?
Generally, no special diet is required, but always follow your doctor’s instructions. If fasting is advised, avoid food and liquids (except water) for 8–12 hours before the test.
What does it mean if my protein levels are abnormal?
Abnormal results may signal conditions like protein-losing syndromes, infections, or metabolic disorders. Your doctor will interpret the findings in the context of your medical history and symptoms to guide further testing or treatment.
  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