A new report shows the brains of autistic children, who suffer from the disorder tied to a combination of contributing factors from genes to the environment, have differences in regions that develop during the mother's second trimester of pregnancy.
Complement component 4 is a blood test that measures the activity of a certain protein that is part of the complement system. The complement system is a group of proteins that move freely through your bloodstream.
C4 plays an important role in eliminating certain infections. The complement component 4 (C4) test is a simple blood test that measures your level of C4. A low level of C4 is associated with autoimmune and collagen vascular diseases, such as lupus and rheumatoid arthritis.