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Immunoassay reagents intended to perform qualitative and/or quantitative analyses on a body fluid sample (e.g., serum) to determine the active first third terminal fragment (amino acid sequence 1 to 34) of the parathyroid hormone ([PTH]; i.e., N-terminal PTH fragment). The level of N-terminal PTH in serum has been used to determine the cause of hypercalcemia and hypocalcemia and he parathyroid function status in disorders such as bone and mineral metabolism and renal failure. These assays are not useful to measure PTH in normal people.
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