What It Measures
The blood level of LH, a pituitary hormone that signals the testes to produce testosterone.
LH stimulates Leydig cells in the testes to produce testosterone. It is a key regulator in the HPG axis and helps differentiate between primary and secondary hypogonadism.
Current Value
What High Means
Elevated LH with low testosterone indicates primary hypogonadism (testicular failure). The pituitary is working harder to stimulate failing testes.
Possible Symptoms
Signs of primary hypogonadism: low T symptoms despite high LH drive
What Low Means
Low LH with low testosterone indicates secondary hypogonadism (pituitary or hypothalamic issue). Also suppressed by exogenous testosterone.
Possible Symptoms
Signs of secondary hypogonadism: low T with low gonadotropin stimulation
Risk Factors
Hypogonadism diagnosis (differentiates primary vs. secondary)
Actionable Advice
Supplements
- •Clomiphene citrate (prescription — stimulates LH)
- •D-aspartic acid
- •Zinc
Diet & Lifestyle
- •Essential for TRT monitoring (suppressed on exogenous T)
- •If low, investigate pituitary function (MRI, prolactin)
- •Healthy lifestyle factors that support HPG axis
Ask AI
Ask questions about your LH results, trends, and what you can do to optimize.
Historical Trend
Related Biomarkers
All Readings
| Date | Value | Change |
|---|---|---|
| 2026-01-28 | 0.2 | 0.0 |
| 2025-08-25 | 0.2 | -3.9 |
| 2025-06-27 | 4.09 | — |