What is the normal range for prolactin?
May 28, 2022
Source: Cainiu Health
Dr. Pan Yongyuan
Introduction
For women, the normal serum prolactin range is 1.61–18.77 ng/mL. Conditions such as polycystic ovary syndrome (PCOS) or pituitary adenoma may cause elevated serum prolactin levels; in severe cases, this can lead to infertility. During late pregnancy and lactation, prolactin secretion increases significantly to promote mammary gland development and milk production.
In women, prolactin primarily promotes mammary gland development and stimulates milk production during late pregnancy and lactation. So, what constitutes a normal prolactin level?
What Is the Normal Range for Prolactin?
For women, the normal serum prolactin level ranges from 1.61 to 18.77 ng/mL. Conditions such as polycystic ovary syndrome (PCOS) or pituitary adenoma may cause elevated serum prolactin levels. In severe cases, hyperprolactinemia can lead to infertility. During late pregnancy and lactation, prolactin secretion increases markedly to support mammary gland development and lactation. Appropriate prolactin secretion is essential for maintaining regular menstrual cycles, ovulation, and fertility. Elevated prolactin levels disrupt gonadotropin secretion, impairing normal follicular development and maturation—resulting in menstrual irregularities or amenorrhea. In unmarried women, amenorrhea often leads to anovulation and subsequent infertility.
In non-pregnant women, the normal prolactin level is less than 1.14 mmol/L; during early pregnancy, it is less than 3.64 mmol/L; during mid-pregnancy, less than 7.28 mmol/L; and during late pregnancy, less than 18.20 mmol/L. Treatment should be tailored according to the underlying cause.
If a patient presents with amenorrhea and galactorrhea alongside serum prolactin levels exceeding 200 μg/L, imaging studies—including CT or MRI of the pituitary gland—should be performed to investigate potential causes of hyperprolactinemia and guide appropriate treatment. We hope this information is helpful to you!
