Expected LH and FSH Levels in Postmenopausal Women
In postmenopausal women, expect FSH levels of approximately 75 IU/L and LH levels of approximately 38 IU/L, though these values can vary considerably and are not required for diagnosis in women with clear clinical menopause.
Diagnostic Approach
The Endocrine Society guideline 1 explicitly states that in women with an intact uterus, menopause is a clinical diagnosis based on cessation of menses for at least 12 months, and sex steroid or gonadotropin measurements do not further inform the diagnosis. Laboratory testing should only be pursued when establishing menopause is necessary for patient management in specific scenarios:
- Women who have undergone hysterectomy without bilateral oophorectomy
- Women with inadequate menstrual history to determine menopausal status
When laboratory confirmation is needed, the guideline recommends replicate measures of FSH and serum estradiol (with estradiol < 20 pg/mL supporting menopause) 1.
Expected Hormone Values
FSH and LH Levels
The most comprehensive data shows postmenopausal women have:
- FSH: 75.43 IU/L (mean)
- LH: 37.59 IU/L (mean)
- Estradiol: 117 pmol/L (mean) 2
These values represent a dramatic shift from premenopausal levels, with FSH rising by a factor of 13-18 times and LH by a factor of 3-3.4 times compared to early proliferative phase values 3.
Temporal Dynamics
Important caveat: Gonadotropin levels are not static after menopause. The classic pattern shows 3:
- Peak levels occur 2-3 years post-menopause (FSH up to 18.4× and LH up to 3.4× proliferative phase values)
- Gradual decline over subsequent decades to 40-50% of peak levels
- Recent evidence demonstrates three distinct FSH trajectory patterns in postmenopausal women, with some showing stable levels, others increasing 30 years post-menopause, and a subset initially declining then increasing 20 years post-menopause 4
Clinical Thresholds
From population-based data, FSH ≥ 20 IU/L has 73% specificity for postmenopausal status 5. However, this threshold is more useful for research than clinical diagnosis, as the guideline prioritizes clinical criteria.
Key Clinical Pitfalls
Do not order gonadotropins routinely: The guideline is clear that these tests do not influence management in women with straightforward clinical menopause 1
Single measurements are unreliable: If testing is necessary, obtain replicate measures due to significant variability 1
Smoking affects levels: Current smoking is associated with increased FSH levels, potentially confounding interpretation 5
Oophorectomy status matters: Women with unilateral oophorectomy may have higher FSH levels than those with both ovaries intact 5
Wide individual variation exists: Recent trajectory analysis shows substantial heterogeneity in postmenopausal gonadotropin patterns, with some women maintaining relatively low levels while others have persistently elevated values 4