Normal DHEA-S Levels in Postmenopausal Women
In postmenopausal women, normal serum DHEA-S concentrations are approximately 0.47 µmol/L (or 0.5 µmol/L), which is markedly lower than levels in premenopausal women.
Reference Range Context
The available guideline evidence provides specific values for postmenopausal DHEA-S levels:
- Postmenopausal women: DHEA-S levels are typically <0.5 µmol/L according to the Endocrine Society guidelines 1
- For comparison, premenopausal women have DHEA-S levels around 1.25-1.58 µmol/L 2
A research study from 1979 reported postmenopausal DHEA-S levels as 0.47 ± 0.07 µmol/L (mean ± SE), which aligns closely with guideline thresholds 2. This represents approximately a 60-70% reduction compared to reproductive-age women.
Age-Related Decline
DHEA-S undergoes progressive, linear decline with aging, independent of menopause itself 3:
- The decline averages 1.5-2.81% per year throughout adult life
- The relationship to menopause is complex—some studies show a late perimenopausal transient increase of 3.95%, but overall the age-related decline predominates
- By the postmenopausal years, levels are substantially suppressed compared to peak values in the 20s-30s
Clinical Interpretation Caveats
Assay Variability
Exercise extreme caution when interpreting absolute DHEA-S values—unlike testosterone, there is poor correspondence between immunoassays and mass spectrometry methods for DHEA-S measurement 3. Published absolute values may not be reliable across different laboratory platforms. Always use your local laboratory's age-specific reference ranges.
Pathological Thresholds
While normal postmenopausal levels are low (~0.5 µmol/L), certain values suggest pathology:
- DHEA-S >16 µmol/L (>600 µg/dL) strongly suggests adrenal adenoma or tumor 4, 1
- DHEA-S <40 µg/dL (~1.1 µmol/L) in the context of adrenal adenoma suggests autonomous cortisol secretion with 84% specificity 5
Clinical Utility
DHEA-S levels "well below the lower limit of normal for age and sex" can be a useful initial sign of primary adrenal insufficiency, though they cannot diagnose it in isolation 6. In postmenopausal women already at the lower end of normal, this marker becomes less discriminatory.
Conversion Factor
For unit conversion: 1 µg/dL = 0.027 µmol/L (approximate)
Therefore, the commonly cited threshold of <0.5 µmol/L for postmenopausal women equals approximately 18-19 µg/dL.