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Ask your clinician to use performing-lab range and trend with C4/CH50 and disease activity.

Estrogen, thyroid, liver disease, insulin resistance, age, and medications affect SHBG.

Age, sex, nutrition, liver disease, diabetes, and assay matter.

Understand why homocysteine became a health topic and why lowering a blood number is not the same as preventing disease.

…es infections, kidney inflammation, and complement-mediated disease. The word “homozygous” alone does not show whether a finding reduces function, increases activity, or is a common benign variant. Bring these questions to your visit Ask f…

… the connection Ulcerative colitis is an inflammatory bowel disease affecting the colon. Diagnosis and disease activity require a combination of symptoms, examination, and testing. Follow the pathway Dr. Purser explains TNF-alpha, IL-12, I…

… skin-cell growth. Some people also have inflammatory joint disease. Follow the pathway Dr. Purser explains the IL-23/Th17 pathway and distinguishes IL-17A and IL-17F from IL-17C produced by skin cells. This helps explain the feedback betw…

…response and one associated with connective-tissue or other disease. Bring these questions to your visit Ask whether examination, nailfold assessment, antibodies, or other tests would help distinguish the type. Persistent sores or marked p…

…s inflammation inside the eye. The cause may involve immune disease, infection, or another process, so an eye examination is essential. Follow the pathway Dr. Purser follows IL-12 and the Th1 response into IFN-gamma, TNF-alpha, macrophage …

… is an autoimmune condition that can affect several organs. Disease activity is assessed through symptoms, examination, and multiple tests. Follow the pathway Dr. Purser discusses type I interferons, BAFF/BLyS, IL-17, and other cytokines i…

…. Understand the connection F9 encodes clotting factor IX. Disease-causing variants can be involved in hemophilia B, a bleeding disorder. F9 is on the X chromosome, which changes how inheritance is described. Follow the pathway Dr. Purser…

…means inflammation of the rectal lining. Inflammatory bowel disease, infection, radiation, and other causes can produce different patterns. Follow the pathway Dr. Purser connects TNF-alpha, IL-1 beta, IL-6, and T-cell pathways with local t…