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The TSH test measures the levels of TSH, a hormone that is made and released by your pituitary gland. Your pituitary can sense whether there is enough thyroid hormone in the bloodstream, and it releases TSH when it detects insufficient thyroid hormone. Written or medically reviewed by a board-certified physician.
Back to Top Why the Test Is Performed. Total complement activity (CH50, CH100) looks at the overall activity of the complement system. Typically, other tests that are more specific for the suspected disease are performed first. C3 and C4 are the most commonly measured complement components.A complement test may be used to monitor patients with an autoimmune disorder and to see if treatment for their condition is working.For example, patients with active lupus erythematosus may have lower-than-normal levels of the complement proteins C3 and C4.Complement activity varies throughout the body. complement test may be used to monitor patients with an autoimmune disorder and to see if treatment for their condition is working. For example, patients with active lupus erythematosus may have lower-than-normal levels of the complement proteins C3 and C4. Complement activity varies throughout the body.