parathyroid hormone

This term refers to a specific biochemical signaling molecule essential for calcium homeostasis. In medical and scientific discourse, it is frequently abbreviated as PTH. The term is used exclusively within clinical, biological, and physiological contexts to describe the endocrine regulation of mineral balance in the body.

As a specific chemical substance and hormone, the term is treated as an uncountable noun. It describes a mass of a particular substance rather than individual units, meaning it does not have a plural form in standard medical usage.