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Individual test · Labcorp 004220

Complement C3a

This test measures C3a, a small protein fragment released when your immune system is active. It helps show if your body is currently reacting to inflammation or an immune trigger. Doctors use this information to see if symptoms are related to an overactive immune response rather than other causes. However, this test cannot pinpoint the specific disease causing the reaction or provide a diagnosis by itself.

How ordering works

  1. 1

    Review the order and pay on Picardo. Your account is set up as you check out.

  2. 2

    A licensed physician reviews the order and decides whether to authorize it.

  3. 3

    Give blood at a Labcorp location, or book an at-home draw for $75.00.

  4. 4

    Your results arrive in your Picardo account.

For adults 18+ in the US. Lab orders aren’t available in New York, New Jersey, Rhode Island, Pennsylvania, Maryland, Massachusetts, Hawaii or Maine.