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Complement C1q Blood Test, Quantitative

* This is not a home test kit. You will need to visit a local lab for testing.

Also Known As

Complement Activity C1q, Complement Antigen

The Purpose of a C1q Blood Test

You know a fully functioning immune system keeps you healthy by fighting off germs that can cause illness and preventing autoimmune conditions. But what helps keep your immune system strong? The proteins in your body’s complement system. There are nine major proteins, numbered C1 through C9, which are mostly produced by the liver. They can be measured individually or all at once, usually to diagnose or monitor certain infections or autoimmune disorders. A C1q blood test is often used in cases involving the most common form of lupus, systemic lupus erythematosus (SLE), or recurrent bacterial infections.

Complement C1q, Quantitative (981)
Complement C1q, Quantitative (016824)

What Does the C1q Test Measure?

This test analyzes the level of C1q complement proteins in your body.

Who Should Take a C1q Complement Test?

You may take the C1q test if you have SLE, suspect you have it, or are suffering from chronic inflammation or infections.

Complement C1q Test Preparation

There are no special preparations or instructions you need to follow prior to the C1q complement test.

Quantitative Complement C1q Blood Test Results

Normal reference ranges for adults taking a complement C1q test are 10.2 to 20.3 for men and 10.3 to 20.5 for women. Results outside these ranges could indicate an autoimmune issue and may require further testing. If you have already been diagnosed with SLE, these tests can tell you if your health management plan is working. To help you determine your next steps, book a telehealth visit with one of our Personalabs doctors.

Where Can I Get a Complement C1q Blood Test Near Me?

When you need a liver test, like the quantitative complement C1q blood test, you can purchase it at Personalabs. You’ll enjoy the convenience of shopping online from our collection of 400-plus tests and the ease of testing at a Labcorp or Quest Diagnostic labs, with more than 4,000 locations to choose from across the country.

Here’s how it works:

Step 1: Buy your test and download the lab order. (You won’t need approval from your doctor beforehand, depending on the state where you live.)

Step 2: Use our lab locator to find the nearest facility to you and schedule your blood work appointment.

Step 3: Bring the lab order to your appointment and give your blood sample.

Step 4: Check for the results in your secure Personalabs account, typically within 2 to 10 business days after taking your test. (Have a specific turnaround time? Just contact us, and we will reach out to the lab, as times can vary.)

Order your Personalabs test today and get the information you need to feel empowered in your healthcare choices.

Additional information


LabCorp, Quest

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Generate & Print Out Lab Order

Our physician network will approve your order within 2-4hrs.



Visit the Lab

The test price decides which lab you will visit: Quest or Labcorp. Find a location in your area.



Get Your Results

Results can be provided in as little as 24-48 hrs. For more complex tests, please contact us for turn around times.


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