Understanding what an endocrinologist does begins with understanding what the endocrine system is. The endocrine system is a series of glands that produce and secrete hormones that the body uses for a wide range of functions. These control many different bodily functions, including: 1  Respiration.
Most ovulation tests may be used at any time of the day; some suggest testing first thing in the morning, although this is not required. For greater success, test about the same time each day, and reduce your liquid intake for four hours beforehand.
They work by detecting the hormone LH. Sometimes they are called OPKs, ovulation predictor kits, or simply ovulation tests. When you buy an ovulation test kit, it comes with several tests strips (narrow thin papers), or they may look more like pregnancy test sticks. You either pee on the extended tip of the pregnancy-test-like version, or you pee in a cup and then carefully dip the test strip into your urine.