C4 and C3 Complement Blood Test
The C4 and C3 complement blood tests are laboratory tests that measure the levels of two complement proteins in the blood. Complement proteins are part of the body’s immune system and play a role in defending against infections and other threats to the body.
C3 and C4 complement proteins are produced by the liver and circulate in the blood. Low levels of these proteins may indicate a deficiency in the complement system, which can increase the risk of infections and other immune-related diseases.
The C3 complement test measures the level of C3 protein in the blood. The normal range for C3 levels in the blood is between 90 and 180 milligrams per deciliter (mg/dL). Elevated levels of C3 may be associated with certain autoimmune diseases, such as lupus and rheumatoid arthritis.
The C4 complement test measures the level of C4 protein in the blood. The normal range for C4 levels in the blood is between 10 and 40 mg/dL. Low levels of C4 may be associated with certain autoimmune diseases, such as lupus, and may also indicate a deficiency in the complement system.
Both C3 and C4 complement tests are often used in combination to diagnose and monitor autoimmune diseases, such as lupus, and to evaluate the effectiveness of treatment. In some cases, other tests may be ordered to confirm a diagnosis or determine the specific type of autoimmune disease present.
The C3 and C4 complement blood tests are simple procedures that involve taking a small sample of blood from a vein in the arm. The samples are then sent to a laboratory for analysis. Results are usually available within a few days.
In summary, the C3 and C4 complement blood tests are useful tools in the diagnosis and monitoring of autoimmune diseases and complement deficiencies. If you have symptoms of an autoimmune disease or are at risk of developing one, talk to your healthcare provider about whether these blood tests may be appropriate for you.
This page is provided for educational and informational purposes only and does not constitute the provision of medical advice or professional services. The information provided should not be used for diagnosing or treating a health problem or disease, and those seeking personal medical advice regarding any of the tests and conditions referenced above are advised to consult with a licensed clinician. Always seek the advice of your qualified health provider regarding a medical condition and do not disregard professional medical advice or delay in seeking it because of any information on this page. If you think you may have a medical emergency, immediately call 911 or go to the nearest urgent care center or hospital.
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