Sex hormones
Luteinizing hormoneLH
Pituitary gonadotropin; surge triggers ovulation, drives Leydig-cell testosterone.
Sample
Serum
Clinical reference range
1.7 to 8.6 IU/L
Follicular
Conv: 1.7–8.6 IU/L
Biology
What it measures
Pulsatile under GnRH control.
Clinical use
Why we order it
Localize hypogonadism (high in primary, low/normal in secondary), confirm menopause, PCOS (LH/FSH >2).
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