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.
Ovulation can begin as early as 12 hours after a positive ovulation test and if you were to test only every 24 hours you could be missing out on roughly 12 hours of ovulation to increase your chances of success. So testing twice daily beginning on Cycle Day 10 could help you catch the egg.