C4 Blood Test

The C4 blood test measures the level of complement component 4 (C4).

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C4 Blood Test FAQ

What is a C4 test?

The C4 test measures the level of C4 proteins in the blood.

Why is a C4 blood test important?

C4 is a part of a portion of the immune system known as the complement system. Abnormal levels of C4 can be associated with autoimmune conditions like lupus.

What type of specimen will I submit?

This C4 Blood Test is a blood test.

Do I need to fast to take this test?

Fasting is not necessary.

How long does it take to get test results?

It typically takes 4 business days or less.

Accesa Labs does not provide medical advice, diagnosis or treatment. All users should consult with a medical provider for specific health concerns.

Last updated on December 5, 2017

C4 Blood Test for $119

C4 Test - More Information

The C4 blood test, also known as a complement component C4c test, measures the C4 blood level.

Decreased C4 blood levels may suggest glomerulonephritis, systemic lupus erythematosis (SLE), cryoglobulinemia, or another autoimmune condition. To get a C4 blood test near you, just order online and get your blood drawn at the selected Quest Diagnostics location. Once your C4 lab report is ready, it will be available for download. As can be seen on the sample C4 lab report above, the C4 blood levels are reported as a number and can be compared against the reference ranges provided by the lab.

C4 Blood Test at Guaranteed Prices.
Our C4 Blood Test price includes the following:
  • A doctor's lab order
  • 24 / 7 order processing
  • Access to 1000+ Quest labs
How It Works
1. Order Online
No separate office visit required.
2. Visit Lab
Get tested at a lab near me.
3. Receive Results
Get electronic results securely.