Progesterone levels: Normal ranges and charts

Progesterone levels by cycle phase

Progesterone is a hormone produced by the ovaries and in small amounts by adrenal glands, and its main job is to prepare the inner uterine lining for potential pregnancy and support the development of the embryo. Your levels stay relatively low during the first half of your cycle, known as the follicular phase. During this time, follicle-stimulating hormone (FSH) takes the lead to recruit the follicles into the cycle and select the one that will become dominant, while a surge in luteinizing hormone (LH) eventually triggers the burst of mature follicle, which is called ovulation. After you ovulate, your body ramps up progesterone production to prepare for a fertilized egg.

Below is a comparison of normal blood progesterone levels across the different phases of the menstrual cycle. Please note that you can also find saliva and urine metabolite measurements. These reference ranges use nanograms per milliliter (ng/mL) as the primary unit, though some clinics may provide results in nanomoles per liter (nmol/L).

Health Encyclopedia. Progesterone. University of Rochester Medicine. 

(Note: Ranges can vary slightly depending on the specific laboratory analyzing your blood.)

Luteal phase and ovulation confirmation

Once an ovary releases an egg, the empty follicle transforms into a temporary gland called the corpus luteum. This structure pumps out progesterone to thicken the uterine lining, creating an ideal environment for successful implantation. Doctors often check your blood at seven days past ovulation, frequently referred to as 7DPO, to confirm that you actually ovulated. At this point in your luteal phase, levels typically rise above 3 ng/mL or 5 ng/mL to confirm ovulation occurred. Progesterone levels often sit above 10 ng/mL in cycles that lead to pregnancy. Doctors often evaluate consistently low levels during this window if you are experiencing infertility or have concerns about an ectopic pregnancy.

Testing too early or too late in your luteal phase can return a falsely low result if your main goal is to confirm ovulation, which might cause unnecessary worry. If your cycle is exactly 28 days long, a test on day 21 makes sense, but if your cycle is 35 days long, you would need to test around day 28. Your results always need to be correlated to your specific cycle timeline.

Progesterone levels during pregnancy

If pregnancy occurs, progesterone levels rise significantly to prevent the uterus from contracting. During the early weeks, the corpus luteum continues to produce the hormone to sustain the pregnancy. Around 10 weeks, the placenta matures and takes over production entirely.

Your body will continue to produce increasing amounts of this hormone until you deliver. The table below maps the typical progression of progesterone levels by trimester.

Health Encyclopedia. Progesterone. University of Rochester Medicine. 

It’s completely normal for your exact numbers to fluctuate day by day. If you have any concerns about your lab results or experience unexpected symptoms, reach out to your healthcare provider for personalized medical advice.

Interpreting abnormal progesterone levels

Waking up anxious or struggling with sleep disturbances are common physical experiences when progesterone drops sharply from very high to low levels. Your body releases this hormone in pulses, so your serum levels can fluctuate significantly from one hour to the next. A single normal blood test might not capture the full story if you are still dealing with these frustrating symptoms.

Conditions that affect hormone balance, such as polycystic ovary syndrome, also recently renamed polyendocrine metabolic ovarian syndrome (PMOS), can impact your natural baseline. Conversely, unusually high levels outside of pregnancy can indicate other health issues, such as congenital adrenal hyperplasia, a condition affecting the adrenal glands.

Monitoring hormone health trends

Because one-time serum tests are subject to those hourly pulsatile fluctuations, tracking your data over time provides a much clearer picture. The Hormona app serves as a helpful educational tool for tracking longitudinal symptom patterns across several cycles. 

For a quantitative approach, the Hormona Wellness Kit allows you to monitor progesterone metabolites (PdG) in your urine. These urine metabolites are typically measured in ug/mL. Tracking these PdG trends at home offers a more comprehensive view of your ovulation and luteal health than relying on a single clinic visit.

Supporting healthy progesterone levels

If you suspect your levels are low, certain dietary adjustments may help support your body’s natural production. Nutrients like vitamin B6 and vitamin C and magnesium are widely recognized for supporting overall cellular function and metabolic health. By focusing on a nutrient-dense diet, you give your ovaries the essential building blocks they need to function optimally. Before making any changes to your routine or trying new supplements, always speak to your doctor or healthcare provider.

When to seek medical consultation

When you book your next appointment, bringing specific data can help you self-advocate and get the answers you need. Use the table below to map your physical experiences to specific questions for your doctor.

FAQs

What do progesterone levels tell you?

These levels indicate whether you have successfully ovulated and if your body is producing enough of the hormone to stabilize your uterine lining. During pregnancy, progesterone levels can help assess the risk of miscarriage or ectopic pregnancy, or simply confirm that the pregnancy is progressing healthily.

What is a normal progesterone level in perimenopause?

During perimenopause, ovulation becomes irregular, so your levels will frequently drop lower than the typical 2 to 25 ng/mL luteal range seen in your reproductive years.

Is it better to have high or low progesterone?

It is best when hormone levels rise and fall right on schedule. For example, if progesterone levels are higher than expected during the luteal phase, it could be an early sign of pregnancy. If they are low, however, it usually means ovulation did not happen this cycle, which is very common during the transition to menopause.

What vitamin increases progesterone?

Vitamins B6 and C are frequently recommended to support natural hormone production, though they do not contain hormones themselves. It is helpful to know that progesterone is mainly produced after ovulation occurs. Because of this, consuming a nutrient-dense diet supports overall health and regular ovulation, which naturally leads to optimal progesterone levels during the luteal phase. There is no biological need to increase progesterone during the follicular phase or the first half of the cycle.

Does magnesium increase progesterone?

Magnesium supports overall endocrine health and cellular function. While it may not directly manufacture the hormone, it helps create a supportive biological environment for hormone balance.

What is a good progesterone level for a 50 year old woman?

For women who have reached postmenopause, levels typically remain very low, usually under 1 ng/mL or undetectable. This is entirely normal, as the ovaries are no longer releasing eggs.