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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.
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 or CH100) may be ordered to look at the integrity of the entire classical complement pathway.omplement 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 or CH100) may be ordered to look at the integrity of the entire classical complement pathway.