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Serum Protein Electrophoresis (SPEP)

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Serum Protein Electrophoresis (SPEP) Test

Serum Protein Electrophoresis (SPEP) is a laboratory test that separates proteins in the blood based on their electrical charge and size. It is used to diagnose and monitor conditions related to abnormal protein production, such as multiple myeloma, immune disorders, and liver or kidney diseases.

Why is the Test Done?

A doctor may order an SPEP test if a patient has:

✅ Unexplained weight loss or fatigue
✅ Bone pain (suggestive of multiple myeloma)
✅ Frequent infections (immune system disorders)
✅ Kidney or liver disease
✅ Abnormal total protein levels in previous blood tests
✅ Symptoms of a plasma cell disorder (e.g., numbness, tingling, or anemia)

How is the Test Done?

  1. Blood Sample Collection:

    • A blood sample is drawn from a vein.
    • Sent to a lab for electrophoresis analysis.

  2. Lab Analysis:

    • Proteins in the blood are separated using an electric field.
    • The results are displayed as a graph with peaks representing different protein fractions.

Types of Proteins Detected in SPEP

The major proteins in the blood are divided into five main groups:

Protein Fraction Normal Percentage Significance
Albumin 55-65% Maintains blood volume & transports substances
Alpha-1 Globulins 2-5% Includes α1-antitrypsin (protects tissues)
Alpha-2 Globulins 6-13% Includes haptoglobin (binds free hemoglobin)
Beta Globulins 8-15% Includes transferrin (iron transport) & complement proteins
Gamma Globulins 10-20% Includes immunoglobulins (IgG, IgA, IgM), involved in immunity

Interpreting the Results

Abnormal Pattern Possible Cause
Increased Albumin Dehydration
Decreased Albumin Liver disease, kidney disease, malnutrition
Increased Alpha-1 Globulins Inflammation, infection
Increased Alpha-2 Globulins Chronic inflammation, kidney disease
Increased Beta Globulins Iron deficiency, liver disease
Increased Gamma Globulins (Polyclonal) Chronic infections, autoimmune diseases
Sharp Monoclonal “M” Spike in Gamma Region Multiple myeloma, Waldenström’s macroglobulinemia

📌 If a Monoclonal (“M”) Protein Spike is Found:

  • Further testing is needed, including Urine Protein Electrophoresis (UPEP), Immunofixation Electrophoresis (IFE), and Bone Marrow Biopsy.

Next Steps After an Abnormal SPEP Result

🔬 Additional Tests May Be Ordered:

  • Immunofixation Electrophoresis (IFE): Confirms if abnormal protein is a monoclonal (M-protein).
  • Serum Free Light Chain Test (FLC): Helps diagnose multiple myeloma.
  • Complete Blood Count (CBC): Checks for anemia or abnormal white blood cells.
  • Kidney & Liver Function Tests: To assess organ involvement.

💊 Treatment & Management Depend on the Underlying Condition:

  • Multiple Myeloma: Chemotherapy, targeted therapy, or stem cell transplant.
  • Autoimmune Diseases: Immunosuppressants or steroids.
  • Liver/Kidney Disorders: Managing the primary disease.