Low Progesterone: What It Means and What to Do Next
Low progesterone (below 1.8 ng/mL on cycle day 21) suggests ovulation may not have occurred or was inadequate. Low progesterone contributes to irregular periods, difficulty conceiving, and early miscarriage. In perimenopause, declining progesterone is expected and drives hot flashes and sleep disruption.
What Causes Low Progesterone?
Anovulation
If ovulation doesn't occur, the corpus luteum doesn't form, and progesterone remains low throughout the cycle.
Luteal Phase Defect
The corpus luteum doesn't produce enough progesterone, even though ovulation occurred. Can cause short luteal phases.
Perimenopause
Progesterone production naturally declines as ovarian function decreases in the years before menopause.
Chronic Stress
The body may preferentially produce cortisol over progesterone when under chronic stress ("pregnenolone steal").
PCOS
Irregular or absent ovulation in PCOS leads to chronically low progesterone levels.
Associated Symptoms
What to Do Next
1. Retest to confirm
A single abnormal result should be confirmed with a repeat test. Temporary factors like stress, illness, or medications can affect results.
2. Related tests to consider
3. When to see a doctor
If your Progesterone is significantly abnormal, if you have severe symptoms, or if repeated results confirm the abnormality, consult a healthcare professional for appropriate evaluation and treatment.
Related Conditions
Frequently Asked Questions
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This page is for informational purposes only and does not constitute medical advice. Consult a healthcare provider for interpretation of your results.
Content reviewed for accuracy by the JustLabs editorial team.