What does C3 and C4 test for?
Complement tests, most commonly C3 and C4, are used to determine whether deficiencies or abnormalities in the complement system are causing, or contributing to, a person’s disease or condition. Total complement activity (CH50) may be ordered to look at the integrity of the entire classical complement pathway.
What does a high C3 and C4 mean?
It seems that elevated C3 and C4 are likely to result of increased synthesis in the liver in response to cytokines e.g. IL-1β, IL-6 or tumor necrosis factor (TNF), which are increased in active CU and are known to control synthesis of the APR proteins [9].
What does a C4 complement test for?
This test measures the amount of C4 proteins in your blood. These proteins are part of your complement system, an important part of your immune system that helps kill disease-causing bacteria and viruses.
What does it mean if your C4 is high?
Higher-than-normal complement C4 values may be a sign of cancer, ulcerative colitis, and inflammation in general. Lower-than-normal complement C4 values could indicate: bacterial infections.
What is normal C4 level?
Normal Results Normal ranges for C4 is 15 to 45 milligrams per deciliter (mg/dL) (0.15 to 0.45 g/L).
What causes low C3 and C4 levels?
Low C3 and C4 levels, below 60 for C3 and 15 for C4 (in the usual American measure), occur in active lupus, especially in the setting of kidney disease or immune breakdown of blood cells (autoimmune hemolytic anemia, AIHA). Some types of lupus, such as brain disease, do not cause low complement levels.
What causes C3 to be high?
Your complement levels will often rise very high just after an infection or injury. When your complement system responds to ongoing disease such as lupus, levels usually go down. You can inherit a deficiency in your complement C3. But it’s much more common to acquire a deficiency.
What is a normal C4 complement level?
Normal ranges for C4 is 15 to 45 milligrams per deciliter (mg/dL) (0.15 to 0.45 g/L). Normal value ranges may vary slightly among different laboratories. Talk to your provider about the meaning of your specific test results.
What is considered low C4?
Other rare conditions that may also lower C4 levels include hereditary angioedema and congenital C4 deficiency. Normal complement C4 levels in the blood are between 16 and 47 mg/dL (milligrams per deciliter), or 0.16 to 0.47 g/L (grams per liter). Levels may vary slightly between laboratories.
What is a normal C4 level?
What is C4 in bloodwork?
C4. Complement component 4 is a blood test that measures the activity of a certain protein. This protein is part of the complement system. The complement system is a group of nearly 60 proteins that are found in the blood plasma or on the surface of some cells.
