Serum/Plasma Line Blot Analysis for Antibodies (e.g., Antinuclear Antibodies, ANA) via Electrophoresis

What This Test Measures

The line blot test examines a sample of your blood for antibodies that target different nuclear proteins. These antibodies can be associated with conditions like lupus, rheumatoid arthritis, or other autoimmune disorders. The test looks for distinct bands (lines) that appear when antibodies bind to specific proteins on a blot, helping to differentiate between types of antibodies.

How the Test Works

Your blood sample is separated into components and applied to a specialized gel. An electric current is applied to move the proteins and antibodies through the gel. Antibodies in your blood bind to specific proteins on the blot, creating visible lines (bands) that indicate the presence of certain antibodies.

Why It’s Ordered

A healthcare provider may recommend this test if you have symptoms of an autoimmune disease, such as joint pain, fatigue, rash, or unexplained fever. It can also be used to monitor disease activity or response to treatment in patients already diagnosed with autoimmune conditions.

Preparation and Sample Collection

No special preparation is needed for this test. You’ll have a small needle inserted into a vein in your arm to draw blood. The process usually takes a few minutes. If you’re on blood-thinning medication, let your provider know before the test.