Luteinizing Hormone (LH) Blood Test

The LH Test measures luteinizing hormone—a pituitary signal that drives ovulation (via the LH surge) and supports progesterone production afterward. In women, LH helps regulate estradiol production and ovarian function; levels typically rise after menopause.

Why Measure LH?

Ovulation assessment: Investigate fertility challenges and cycle irregularity.
Hypothalamic–pituitary–ovarian axis: Evaluate suspected pituitary or ovarian disorders.
Menopause context: Elevated LH is common post-menopause.

Preparation & Timing

For fertility evaluation, coordinate timing with your clinician. LH is often interpreted with FSH and estradiol for context.

Understanding Results (High-Level)

Consider cycle day, menopausal status, and medications.
Use alongside E2, FSH, and progesterone for clearer insight.

How the PlexusDx Test Works

At-home finger-prick;
prepaid return mailer
Digital results ~2 business days after lab receipt;
HSA/FSA eligible.

FAQ

Do OPKs replace blood LH? Ovulation predictor kits detect urine LH surges; blood testing adds quantitative context and can be paired with other biomarkers.