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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.
To understand why itâs important, itâs helpful to know what CD4 cells are. CD4 cells (often called T-cells or T-helper cells) are a type of white blood cells that play a major role in protecting your body from infection. A CD4 count of fewer than 200 cells/mm 3 is one of the qualifications for a diagnosis of stage 3 infection (AIDS). 2  ART is recommended for everyone with HIV, but the urgency to start ART is greater in people with low or rapidly falling CD4 counts. 3  Your CD4 count can vary from day to day.