Hormone levels can be impacted by a variety of lifestyle choices, including stress, excessive exercise, lack of sun exposure, and abnormal body weight (BMI 19 or above). These problems may lead to irregular menstruation, which may affect egg maturation, ovulation, and pregnancy implantation. More crucially, any direct or indirect health issue affecting the reproductive system, particularly the ovaries and testes, can cause hormonal imbalances, which can suggest a person's incapacity to release eggs or generate healthy sperm.

• Follicle Stimulating Hormone (FSH): It stimulates the development of follicles from the immature stage to the stage where they contain mature eggs (typically one egg per follicle).
• Luteinizing Hormone (LH): This hormone is crucial for the development and release of eggs.
• Oestradiol (Oestrogen): Created by the developing follicle. When the follicle is larger and of excellent quality, the oestradiol level is higher.
• Progesterone: It fosters an environment that is conducive to the establishment of a pregnancy or the implantation of an embryo.
• Prolactin: Levels have been reported to be greater in breastfeeding mothers. Prolactin levels can frequently rise, which may prevent ovulation or the release of eggs. These circumstances include persistent stress, thyroid function issues, and some small brain tumours known as prolactinomas.
• Anti-Müllerian Hormone AMH: One of the best markers for ovarian reserve assessment. Before beginning fertility treatments, such as assisted conception or IVF, it is almost always checked.

Endocrine evaluation refers to blood tests performed as part of pre-fertility treatment research, including IVF, to measure various hormone levels. In addition to being altered by situations like persistent stress, rigorous exercise, and specific other medical disorders or medications, these hormones can also be aberrant if fertility is lowered.