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Progesterone Blood Test

The Progesterone Blood Test measures progesterone—a key reproductive hormone that helps regulate the menstrual cycle, supports implantation and pregnancy, and interacts with brain neurotransmitters. In this comprehensive panel, progesterone is interpreted with estradiol (E2), LH, FSH, testosterone, thyroid markers, and adrenal hormones for a fuller picture of women’s health. 

Why Measure Progesterone?

  • Cycle insight: Levels rise after ovulation (luteal phase); timing helps confirm ovulation status.
  • Fertility & symptoms: Helps evaluate irregular cycles, luteal phase issues, and abnormal bleeding.
  • Pregnancy support: Adequate progesterone aids early pregnancy maintenance.

Preparation & Timing

For cycle tracking, many clinicians sample in the mid-luteal phase (about 7 days after ovulation). Note cycle day, menopausal status, and any hormone therapy. Fasting is generally not required.

Understanding Results (High-Level)

  • Follicular phase: Lower baseline expected.
  • Luteal phase: Higher levels expected post-ovulation.
  • Post-menopause: Lower levels are typical.

How the PlexusDx Test Works

  • At-home finger-prick collection with prepaid return.
  • Digital results typically in ~2 business days after lab receipt.
  • Order directly online; HSA/FSA accepted. 

FAQs

Does time of day matter? Consistency matters more than exact time; follow your clinician’s timing guidance relative to your cycle.

On birth control? Combined hormonal contraception can suppress natural cyclic progesterone patterns - interpretation should consider current therapy.