Serum or Plasma Protein Electrophoresis (Qualitative) with Bromocresol Green Staining

Why This Test Is Done

Your healthcare provider may order this test to investigate symptoms such as unexplained weight loss, fatigue, bone pain, or swelling in your limbs. It’s also used to screen for conditions like multiple myeloma, where abnormal proteins (like monoclonal gammas) accumulate in the blood. Sometimes, it’s part of a broader evaluation for kidney disease or other systemic illnesses affecting protein metabolism.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample drawn from your arm, similar to other routine blood tests. If you’re taking blood thinners or have a history of bleeding disorders, let your provider know beforehand. Avoid eating or drinking anything (except water) for 8–12 hours before the test if instructed, though this is less critical for protein electrophoresis.

What the Test Results Mean

The test separates proteins into bands based on their size and charge. Normal results show a balanced distribution of proteins (albumin, globulins, etc.). Abnormal patterns—such as extra bands, missing bands, or unusual concentrations—may indicate conditions like monoclonal gammopathy, liver disease, or chronic inflammation. Your provider will interpret results in the context of your symptoms and medical history.

Common Conditions Detected

This test is particularly useful for detecting multiple myeloma (a cancer of plasma cells), amyloidosis (a buildup of misfolded proteins in organs), and other disorders like Waldenström macroglobulinemia or chronic inflammatory diseases. It may also help diagnose kidney problems or monitor treatment responses in patients with protein-related conditions.