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Immunoassay reagents intended to establish points of reference (i.e., calibrate) in tests performed to determine one or more of the group of hormones secreted by the thyroid gland , such as thyroxine (T4) and triiodothyronine (T3). These reagents may be either specific for calibration of a thyroid hormone or, more frequently, appropriate to calibrate a whole set of similar thyroid hormones.
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