LH
LH (luteinizing hormone) is produced by the pituitary gland and triggers ovulation in women and stimulates testosterone production in men. It works alongside FSH to regulate reproductive function.
Category: Hormones
Also known as: lh, luteinizing hormone, lutropin, Interstitial cell-stimulating hormone, Interstitual cell stimulating hormone, Leutinizing hormone, Lutenizing hormone
Reference range: 1.7–8.6 mIU/mL (Source: ABIM)
Standard unit: mIU/mL
High values may indicate
High LH levels may indicate menopause or primary ovarian failure in women, testicular failure in men, polycystic ovary syndrome (PCOS), or pituitary tumors.
Low values may indicate
Low LH levels may indicate pituitary gland disorders, hypothalamic dysfunction, eating disorders, severe stress, or use of hormonal contraceptives, and can lead to infertility.
Frequently asked questions
- What is a normal LH level?
- A typical reference range for LH is 1.7–8.6 mIU/mL (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is LH measured in?
- LH is most commonly reported in mIU/mL. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do LH reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track LH over time?
- Yes. Upload results from any lab and BloodId charts your LH over time against its reference range, so you can see whether the trend is rising, falling, or stable.