Individual tests

C3 is part of the complement system, a group of nearly 60 proteins that work with your immune system, playing a role in protecting the body from infections and removing dead cells or foreign materials. This blood test is often used to diagnose or monitor autoimmune disorders like lupus and rheumatoid arthritis.
The complement system consists of almost 60 proteins that work together to promote immune and inflammatory responses, destroy and remove foreign pathogens like bacteria and viruses, as well as damaged “self” materials (e.g. cells and proteins). C3 and C4 are the most frequently measured complement proteins. These tests measure the amount or activity of complement C4 in the blood.
Anti-CCP are autoantibodies your immune system produces. Autoantibodies can cause disease by attacking the body's healthy cells by mistake. Anti-CCP attacks healthy tissues in the joints, which can cause pain, swelling, and stiffness. If CCP antibodies are present in your blood, it can be a sign of rheumatoid arthritis. Anti-CCP and another test, called an RF test, are usually done to diagnose rheumatoid arthritis.
Bilirubin is a substance produced when old red blood cells are broken down. It mainly exists in two forms in the blood, unconjugated or indirect bilirubin, and conjugated or direct bilirubin. Typically, your liver removes most of the substance from your body. If your liver is damaged or red blood cells are being destroyed faster than normal, excess bilirubin is released into the bloodstream, which can cause your skin and eyes to turn yellow. If jaundice is suspected, a bilirubin blood test can help determine if there is liver disease or hemolysis.
Bilirubin is a substance made during the breakdown of old red blood cells and mainly exists in two forms in the blood, unconjugated or indirect bilirubin, and conjugated or direct bilirubin. Indirect bilirubin will be converted into direct bilirubin by your liver. A blockage in the liver or bile duct is often the cause of an increase in direct bilirubin.
Double-stranded DNA antibodies (ds-DNA Ab) are found primarily in systemic lupus erythematosus (SLE) and are important but not entirely sufficient for diagnosing the condition. Such antibodies are present in 80% to 90% of SLE cases. They are also found in smaller fractions of patients with other rheumatic disorders and chronic active hepatitis, mononucleosis, and biliary cirrhosis.
GGT is an enzyme found throughout the body, especially the liver. If your liver is damaged, GGT may leak into the bloodstream. High levels of GGT in the blood may be a sign of liver disease or damage to the bile ducts.
Helicobacter pylori (H. pylori) is a bacteria that infects the digestive system. Many people with H. pylori are symptomless. However, it can cause digestive disorders, including gastritis, peptic ulcers, and certain types of stomach cancer. This test aids diagnoses of acute and chronic H. pylori infections in patients with gastric and duodenal disease. It also helps evaluate the effectiveness of treatment.
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