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Check normal progesterone levels by pregnancy week and get a standard reference chart.
Lab-specific adult serum reference examples from Mayo PGSN, checked 2026-09-29. The 3.18 factor converts units; interval comparison cannot establish pregnancy viability, miscarriage risk or a need for medication. Use the ranges on the original lab report. Mayo Clinic Laboratories PGSN
Convert units and compare the number with a selected laboratory interval.
| Stage / Gestational Week | Progesterone (ng/ml) | Progesterone (nmol/L) |
|---|---|---|
Adult serum: follicular phaseMenstrual Cycle | ≤ 0.89 | ≤ 2.83 |
Adult serum: ovulationMenstrual Cycle | ≤ 12 | ≤ 38.16 |
Luteal Phase (Days 15-28)Menstrual Cycle | 1.8–24 | 5.72–76.32 |
MenopauseOther | ≤ 0.2 | ≤ 0.64 |
Pregnancy: first trimesterPregnancy | 11–44 | 34.98–139.92 |
Pregnancy: second trimesterPregnancy | 25–83 | 79.50–263.94 |
Pregnancy: third trimesterPregnancy | 58–214 | 184.44–680.52 |
Unit Explanation and Conversion
Two common units are used for clinical progesterone testing. They can be interconverted using a factor of 3.18 (ng/ml × 3.18 = nmol/L).
Disclaimer
This table is for informational purposes only and should not replace a doctor's diagnosis. Reference ranges may vary slightly between different laboratories and testing methods. Please refer to the reference range indicated on your lab report from your hospital, and consult a medical professional promptly if results are abnormal.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This page is for organizing a serum progesterone result reported in either ng/mL or nmol/L. Enter the number and its original unit. You can leave the phase on conversion only, or choose one of the listed adult cycle, pregnancy-trimester or postmenopausal examples to see a numeric comparison. The table can also be filtered by menstrual cycle, pregnancy or other category.
The conversion used is nmol/L = ng/mL × 3.18; to convert back, divide nmol/L by 3.18. For example, 10 ng/mL is 31.80 nmol/L. Results are displayed to two decimal places, so the shown value may be rounded.
The phase rows reproduce adult serum reference examples published for Mayo Clinic Laboratories' PGSN test. Its intervals are: follicular phase ≤0.89 ng/mL; ovulation ≤12; luteal phase 1.8–24; postmenopausal ≤0.20; first trimester 11–44; second trimester 25–83; and third trimester 58–214 ng/mL. The table also shows these values in nmol/L using the 3.18 conversion factor. These are examples for a named laboratory test and method, not a universal standard for every U.S. laboratory or patient.
Progesterone changes with menstrual-cycle timing and pregnancy. A trimester row is a broad reference category; this tool does not estimate a result for a particular gestational week. The ranges are grouped by phase because the matching comparison is only meaningful when the selected category corresponds to the context on the report.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Enter the progesterone value from the report in the number field. Use a nonnegative number; do not add the unit, test name, or reference interval in the same field.
Select ng/mL or nmol/L to match the unit printed next to your result. The other unit is calculated automatically. For a quick check, 5 ng/mL converts to 15.90 nmol/L (5 × 3.18).
Choose the corresponding listed phase or trimester to display a below, within, or above label against that row. Choose conversion only when no listed phase applies or you only need the unit conversion.
Review the entered value, converted value, selected reference row and comparison label. The result can be copied. Use the laboratory's own interval on your report as the primary point of comparison.
Use cases
See how the tool fits into real work and everyday tasks.
If a report uses nmol/L but you are used to ng/mL, enter the reported number and select nmol/L. The converted value gives a like-for-like unit view to discuss with the ordering clinician; retain the original reported value.
Filter the table to pregnancy or menstrual-cycle rows to see how published reference examples are organized by phase. It can help explain why a single number cannot be compared meaningfully without knowing the relevant timing and laboratory interval.
Q&A
Find concise answers to common questions and confusing cases.
Reference intervals can vary with the laboratory, measurement method and clinical context. The table here is explicitly based on Mayo Clinic Laboratories' PGSN examples. Compare your result with the interval printed by the lab that performed your test.
No. It offers three broad trimester examples, not week-by-week ranges or a pregnancy-week calculator. Do not infer a specific week's interval from a trimester row.
It means the entered value falls numerically below or above the selected table row's endpoints after unit conversion. It does not identify a cause, assess pregnancy viability, or recommend treatment.
Leave the selector on conversion only. Check the report details or ask the clinician who ordered the test which cycle or pregnancy context should be used before comparing with a phase-specific interval.
Notes
Review scope, result limitations, and important precautions before use.
The comparison is a numeric match to the selected built-in row, not an interpretation of your personal health. Mayo's intervals are specific to its test and method; laboratories may use different methods and ranges. The built-in rows are adult examples and do not cover every age, clinical situation or gestational week.
Progesterone results need clinical context, including why testing was done, timing in the menstrual cycle and pregnancy status. This page cannot diagnose a condition, predict a pregnancy outcome or guide medication decisions. Do not start, stop or change treatment based on a conversion or comparison label. Ask your healthcare professional to interpret the original report; seek prompt medical care for urgent symptoms.
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