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Complement C4 Blood Test


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


This test is used to measure the level of serum Complement C4. C4 is also used to detect individuals with inborn deficiency of this factor or those with immunologic disease in whom over activation of the immune system causes reduced levels of this complement factor. These diseases include lupus erythematosus, serum sickness, certain glomerulonephritides, chronic active hepatitis, and others.

Complement C4 has been identified a a marker for identifying systemic lupus erythematosus (SLE), a chronic, multisystemic, inflammatory disorder affecting joints, nerves, heart, skin, eyes etc with some amount of irreversible damage.

Recommended For:

Diagnosing SLE.

Special Notes:

No special preparation is necessary prior to blood sample collection.

Tests Included:

Complement C4, Serum (353)
Complement C4, Serum (001834)

Estimated Turn Around For Results:

2-10 Business Days

For an exact turnaround time for results, please contact us at Personalabs and we will contact the lab on your behalf as turnaround times vary depending on testing location or lab testing provider.

  • Step 1

    Step 1 - Order Your Test

    Choose your tests, checkout securely, generate your lab order.

  • Step 1

    Step 2 - Visit The Lab

    Find a location in your area. Print and present your Doctor’s order at the lab.

  • Step 1

    Step 3 - Get Your Results

    In most cases your lab results are available in your confidential Personalabs account in 24-48 hours.


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80% on meds!

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We now offer pharmacy discounts through our PersonalabsRx platform.

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