Bromocresol Purple Protein Electrophoresis (Serum)

What This Test Measures

The bromocresol purple dye binds to different protein fractions in your serum. As the sample moves through a gel during electrophoresis, the dye highlights protein bands, allowing for comparison against normal patterns. This process separates proteins by size and charge, revealing any unusual concentrations or shifts that might indicate disease.

How the Test Works

Electrophoresis uses an electric field to move proteins through a gel matrix. The dye reacts with proteins of varying molecular weight, creating distinct bands that correspond to different protein groups (e.g., albumin, globulins). The pattern helps determine if protein levels are elevated or depleted in specific fractions.

Why It’s Done

Doctors may order this test when they suspect conditions like multiple myeloma (cancer of plasma cells), amyloidosis (abnormal protein buildup), or other disorders that alter protein composition in the blood. It’s also used in research or monitoring rare protein-related diseases.

Sample Collection

A blood sample is drawn from a vein, typically in your arm. The serum portion (liquid after clotting) is separated and sent to the lab for analysis. No special preparation is needed, but fasting may be advised depending on your doctor’s instructions.