Progesterone level charts help you track hormone changes across your menstrual cycle, pregnancy, or fertility treatments. These reference tools translate single measurements into clearer patterns over time.
Use the structured summary below as a quick guide to typical ranges and clinical expectations at different stages.
| Life Stage | Typical Progesterone Range (ng/mL) | Measurement Timing | Clinical Note |
|---|---|---|---|
| Early Follicular | Day 2–4 of cycle | Low supports baseline assessment | |
| Peak Follicular | 1–2 | Just before ovulation | Rising levels signal imminent ovulation |
| Luteal Phase | 5–20 | 7–10 days after ovulation | Levels above 5 support corpus luteum function |
| Early Pregnancy | 10–44 | 5–9 weeks gestation | Corpus luteum then placental source |
| Mid Pregnancy | 20–80 | 10–20 weeks gestation | Placenta becomes primary producer |
| Late Pregnancy | 50–290 | 30–40 weeks gestation | Rising levels prepare for labor |
How Progesterone Level Charts Reflect Ovulation
Ovulation marks the transition from follicular to luteal phase and is a central focus of any progesterone level chart. Around mid-cycle, a surge in luteinizing hormone triggers the release of an egg, and the ruptured follicle becomes the corpus luteum.
The corpus luteum secretes measurable progesterone, typically rising to the 5–20 ng/mL range in the luteal phase. Tracking this increase on a chart helps confirm that ovulation occurred and that the luteal phase is of adequate length for fertility support.
Interpreting Progesterone Levels Across the Menstrual Cycle
Cycle-based interpretation relies on knowing when progesterone should rise and how high it should go. Day 21 or 7 days before the next expected period is a common target for testing in standard 28-day cycles, though timing adjusts for different cycle lengths.
Low mid-luteal levels may indicate anovulation or luteal phase defect, while appropriately elevated values suggest healthy ovulatory function. Comparing each reading against a progesterone level chart helps distinguish normal variation from patterns that warrant clinical follow-up.
Progesterone Levels During Early Pregnancy
After conception, progesterone production shifts from the corpus luteum to the placenta, with levels climbing steadily through the first trimester. Many clinicians use a progesterone level chart to evaluate early pregnancy viability, especially in cases with bleeding or cramping.
Guidelines vary, but levels above 10–15 ng/mL in the first trimester are commonly associated with lower miscarriage risk. Individual targets depend on history, symptoms, and additional hormone markers, so decisions are always personalized.
Practical Factors That Influence Progesterone Testing
No single number tells the whole story; context determines how to read a progesterone level chart. Factors such as cycle regularity, time of day for blood draw, assay type, and whether testing occurs during pregnancy or menopause all affect interpretation.
Working with a healthcare provider ensures that results are aligned with clinical history and that trends on the chart are evaluated alongside symptoms, imaging, and other laboratory values.
Key Takeaways for Using a Progesterone Level Chart
- Use the chart to identify timing for testing and expected ranges at each life stage.
- Track trends rather than single values to better understand ovulation and luteal function.
- Match testing windows to your cycle length or gestational age with clinician guidance.
- Combine chart data with symptoms, imaging, and additional labs for a complete picture.
- Discuss any abnormal patterns with a healthcare provider to tailor next steps.
FAQ
Reader questions
What does it mean if my progesterone is low on day 21 of my cycle?
A level below the typical luteal range may suggest anovulation or a short luteal phase, which can affect fertility and early pregnancy support. Discuss these results with your clinician to determine whether further testing or treatment is appropriate.
Can progesterone levels confirm pregnancy viability on their own?
No, progesterone is one piece of the picture. Your clinician will combine levels with ultrasound findings, symptoms, and sometimes serial measurements to assess viability.
How do irregular cycles affect timing for progesterone testing?
If cycles are irregular, fixed calendar days are less reliable. Testing may be based on the earliest expected period or through a series of measurements to identify any mid-cycle rise.
Do progesterone creams or bioidentical products change how I should interpret my chart?
Exogenous progesterone can raise blood levels and complicate interpretation. Tell your provider about all topical or compounded products so testing aligns with your treatment plan.