Luteinizing Hormone (LH) is a vital hormone in your body produced by the pituitary gland that triggers important processes in your reproductive system for both males and females.. LH helps with menstruation and testosterone production.
Luteinizing Hormone (LH) in Females
LH works in tandem with Follicle-Stimulating Hormone (FSH) to:
- Trigger ovulation: A surge in LH mid-cycle causes the release of a mature egg from the ovary.
- Support progesterone production: After ovulation, LH stimulates the corpus luteum to produce progesterone, which helps maintain the uterine lining for potential pregnancy.
- Regulate menstrual cycles: LH levels fluctuate throughout the cycle, peaking during ovulation.
Luteinizing Hormone (LH) in Males
- Stimulates testosterone production: LH acts on Leydig cells in the testes to produce testosterone, which is essential for sperm production and male secondary sexual characteristics.
Luteinizing Hormone (LH) Testing: Use
Luteinizing Hormone (LH) levels are measured via blood or urine tests to:
- Diagnose fertility issues in both sexes.
- Monitor ovulation timing (especially useful in fertility planning).
- Evaluate puberty disorders (early or delayed onset).
- Assess menstrual irregularities or menopausal status.
Luteinizing Hormone (LH) Levels
| Sex and Factors | LH levels in international units per liter (IU/L) |
|---|---|
| Women, weeks one and two of their menstrual cycle | 1.37 to 9 IU/L |
| Women, week two, before ovulation | 6.17 to 17.2 IU/L |
| Women, weeks three and four of their menstrual cycle | 1.09 to 9.2 IU/L |
| Women, after menopause | 19.3 to 100.6 IU/L |
| Men | 1.42 to 15.4 IU/L |
LH Levels: Interpretation
- High Luteinizing Hormone (LH) :
- May indicate PCOS, premature ovarian failure, or menopause in women.
- In men, it could suggest testicular failure.
- Low Luteinizing Hormone (LH) :
- May point to pituitary gland dysfunction, hypothalamic disorders, or stress-related hormonal suppression.
References
[1] Luteinizing Hormone: Levels, Function & Testing – Cleveland Clinic
[2] Luteinizing hormone (LH) test: Uses, ranges, and results