Hormones
Progesterone
LOINC 2839-9 · ng/mL
What it is
Progesterone is a hormone central to the menstrual cycle and pregnancy. It rises after ovulation to prepare the uterus.
Why it matters
It helps confirm ovulation, evaluate fertility and monitor early pregnancy.
What high values can mean
A higher value is expected in the second half of the cycle and in pregnancy; outside these it is interpreted in context.
What low values can mean
A lower value at the expected time can suggest ovulation did not occur or a luteal-phase issue.
How to improve it
Progesterone reflects reproductive physiology; results are interpreted by your cycle timing and clinical context.
Food & lifestyle
Lifestyle has limited direct effect; overall reproductive health supports normal hormone patterns.
Preparing for the test
Timing is essential — progesterone is often measured about a week before your expected period; note your cycle day.
When to talk to a doctor
Discuss progesterone results with a doctor for fertility or cycle concerns.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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