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.
Here is a brief introduction to some of the available tests and devices that can be used to help you pinpoint your fertile window. 1  Ovulation Kits (OPKs) are a popular method for predicting ovulation. OPKs detect the presence of luteinizing hormone (LH) in your urine.