Day 3 Bloodwork

The hormone levels on Day 3 tell us about the communication between the brain and the ovary. Specifically, how hard does the brain need to work to get the ovary to do its job each month.

As women age, their ovaries become less responsive to the stimulation from the brain. As a result, the brain has to work harder and send more hormone to get the ovary to ovulate. This stimulation happens in the form of a hormone called Follicle Stimulating Hormone (FSH). By checking the hormone levels at the beginning of a cycle, we can get a view into how responsive the ovary is to the messages sent by the brain. The higher the FSH, the harder the brain is working. When the ovary stops responding to the brain’s stimulation entirely, FSH reaches peak levels consistent with menopause.