What is the normal value of luteinizing hormone (LH)?

Oct 27, 2021 Source: Cainiu Health

Dr. Xu Yongqian

Introduction

Luteinizing hormone (LH) is a glycoprotein hormone secreted by the basophilic cells of the anterior pituitary gland. LH levels are typically 2–15 mIU/mL in the preovulatory phase, 30–100 mIU/mL at mid-cycle (ovulation), and 4–10 mIU/mL in the postovulatory phase. During non-ovulatory phases, the normal reference range is generally 5–25 mIU/mL.

Luteinizing hormone (LH) is a hormone secreted in females that plays a crucial role in fertility. Abnormally high or low LH levels can lead to physiological disturbances and potentially impair normal conception.

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What Are the Normal Values for Luteinizing Hormone?

Luteinizing hormone is a glycoprotein hormone secreted by basophilic cells in the anterior pituitary gland. Working synergistically with follicle-stimulating hormone (FSH), LH promotes luteinization—the formation of the corpus luteum—and subsequent progesterone secretion. Normal LH levels vary across the menstrual cycle: during the preovulatory phase, they range from 2–15 mIU/mL; at mid-cycle (ovulation), they surge to 30–100 mIU/mL; and during the postovulatory (luteal) phase, they decline to 4–10 mIU/mL. In non-ovulatory phases, typical reference values fall between 5–25 mIU/mL. LH is one of the six key sex hormones assessed in female hormonal profiling and plays a pivotal role in conception. Specifically, LH triggers ovulation and supports corpus luteum formation and progesterone production—essential prerequisites for successful pregnancy. Disruption of this delicate hormonal balance may result in infertility.

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Knowledge Extension: What to Do If LH Levels Are Low

1. Progesterone Supplementation

If diagnostic testing confirms low progesterone levels and inadequate endometrial secretory changes during the luteal phase, progesterone replacement therapy may be indicated.

2. Human Chorionic Gonadotropin (hCG)

When ovarian follicles approach maturity, hCG administration can effectively induce ovulation. When administered after ovulation, hCG stimulates corpus luteum development, enhances luteal function, increases progesterone synthesis, and prolongs corpus luteum lifespan.

The above outlines the normal reference ranges for luteinizing hormone. We hope this information proves helpful.

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What does a luteinizing hormone test strip measure?

Luteinizing hormone (LH) test strips, commonly known as ovulation test strips, are primarily used to detect whether a woman is ovulating. They predict the time of ovulation by measuring the level of luteinizing hormone in a woman's urine, thereby helping women of childbearing age identify the optimal time for conception or determine safe periods for contraception. Typically, a morning urine sample is collected and tested using an ovulation test strip to make the assessment.