Complement Protein Concentration (C3) Test

Complement Protein Concentration (C3) Test

Category
Immunity
Sample
Blood sample taken from a vein in your arm
Reports () Terms & Conditions Report time varies with time of sample collection.
In 2 days
Fasting
No Fasting
Age
5+ Years

What Is This Test?

Measures complement C3 in your blood. C3 is a key protein of the complement system, part of the immune defence.

Why this test is performed?

Low levels suggest complement consumption, as in active lupus or some kidney diseases (glomerulonephritis).

Who should take this test?

Recurrent or unusual infections, or monitoring of immune status — as advised by a doctor.

Test Preparation

No fasting needed.

Medical disclaimer · for information only, not medical advice

This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.

In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.

Read our Editorial Policy and Medical Review Process.

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Frequently asked questions

No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.

Blood sample taken from a vein in your arm.

Usually within 15–39 hours after the sample reaches the lab. You will receive the report online.

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