Hidden Hormone Factor in Fertility Struggles

When facing conception difficulties or recurrent pregnancy loss, attention often focuses on the uterus or embryo quality. However, hormonal imbalances, particularly elevated prolactin, can play a crucial role. Prolactin, produced by the pituitary gland, normally rises during pregnancy and breastfeeding. Persistently high levels, or hyperprolactinaemia, can disrupt the delicate hormonal system essential for reproduction.

This disruption occurs as high prolactin can suppress the release of crucial brain signals, affecting Luteinising Hormone (LH) and Follicle Stimulating Hormone (FSH). This interference can lead to irregular or absent ovulation and unpredictable menstrual cycles, making conception challenging. Furthermore, elevated prolactin is associated with pregnancy loss and luteal phase deficiency.

Clinical guidelines, such as a 2025 publication in the Journal of Obstetrics and Gynaecology Canada, recommend prolactin testing for women with recurrent pregnancy loss who also experience irregular periods or unexplained breast discharge. It is important to note that hyperprolactinaemia is one potential factor among others, including chromosomal issues, uterine abnormalities, and thyroid dysfunction.

Causes of elevated prolactin vary, ranging from benign pituitary tumours (prolactinomas) to hypothyroidism, certain medications, stress, or intensive exercise. Diagnosis requires repeat testing under standardized conditions. When confirmed, dopamine agonist medications like cabergoline or bromocriptine are highly effective in normalizing prolactin levels, leading to successful restoration of ovulation and pregnancy outcomes.

For women experiencing reproductive challenges, prolactin testing is a valuable part of a comprehensive hormonal evaluation. These results must be interpreted alongside thyroid function and ovarian reserve assessments, considering that reproductive outcomes are influenced by multiple interconnected factors.