lh (luteinizing hormone)
Reproductive EndocrinologyBlood sample2-3 days
LH (Luteinizing Hormone)
Luteinizing Hormone (LH) helps regulate the menstrual cycle, ovulation, and testosterone production. This test measures its blood level.
Sample
Blood
Results
2-3 days
Prep
Check details
Follow-up
Optional add-on
What this test detects
LH (Luteinizing Hormone)
ECLIA · serum
Quantitative · mIU/mL
When to get this test
Fertility work-up
Helps assess ovulation in women and hormone signalling in men.
Menstrual irregularity
Useful when periods are irregular or absent.
PCOS evaluation
The LH pattern, often alongside FSH, can support a PCOS assessment.
How to prepare
01
Your provider may ask for sampling on a specific day of your menstrual cycle.
Common questions
Why does cycle day matter for LH?
LH surges around ovulation and changes through the cycle. Sampling on the requested day helps the result be read correctly.
Is LH often tested with FSH?
Yes. LH and FSH are frequently checked together because their balance gives a clearer picture of reproductive hormone function.