The endocrine system is involved in all of the integrative aspects of life, including growth, sex differentiation, metabolism, and adaptation to an ever-changing environment.  Hormones are generally thought of a chemical messengers that are transported in body fluids.  They are highly specialized organic molecules produced by endocrine organs that exert their action on specific tarte cells. 


Hormones do not initiate reactions; they are modulators of systemic and cellular responses.  There are many saliva tests available to measure hormone levels.  Your health care provider will order a particular combination of hormone tests, depending on your symptoms.