Progesterone
Measures progesterone hormone levels to assess ovulation, fertility, and reproductive health: no doctor visit required.
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What this test measures
Progesterone is a hormone produced mainly in the ovaries that plays a crucial role in the female reproductive system. Progesterone plays a key role in pregnancy. It is produced after ovulation in the second half of the menstrual cycle. It helps make a woman's uterus ready for a fertilized egg to be implanted. It also prepares the uterus for pregnancy by inhibiting the uterine muscle to contract and prepares the breasts for milk production.
During the menstrual cycle, progesterone levels remain low during the follicular phase (the first half of the cycle) and rise after ovulation, during the luteal phase. Following ovulation, progesterone is secreted by the ovarian corpus luteum, with serum concentrations rising markedly during the luteal phase. A midluteal measurement: typically around day 21 of a standard 28-day cycle: demonstrates this increase and serves as an indicator of ovulation and its timing, which is particularly valuable in the evaluation of infertility. This test measures the amount of progesterone circulating in the bloodstream, providing valuable insights into ovulatory function and hormonal balance for those trying to conceive or monitoring reproductive health.
Who should consider this test
You might consider this test if you are experiencing any of the following:
- Individuals having trouble getting pregnant or going through fertility treatment, as healthcare providers may check progesterone levels to see if ovaries are releasing eggs (ovulating) normally
- Those wanting to monitor and track ovulation, as measuring progesterone levels can help confirm when ovulation has occurred
- People who have experienced miscarriage, stillbirth, or unusual bleeding, since progesterone plays an important role in supporting a healthy pregnancy
- Individuals experiencing symptoms of hormone imbalance such as irregular periods, mood changes, or sleep disturbances, or those with conditions like PCOS that may affect menstrual cycles
- People with signs of low progesterone such as irregular menstrual periods, hot flashes, and trouble sleeping, or signs of high progesterone such as vaginal dryness and bloating
What to expect
Preparation
For 12 hours before specimen collection, patients should not take multivitamins or dietary supplements (e.g., hair, skin, and nail supplements) containing biotin (vitamin B7). Certain medicines, such as birth control pills or steroids, may affect results. Be sure your provider knows about all medicines, herbs, vitamins, and supplements being taken. This includes medicines that don't need a prescription and any illegal drugs. Timing is important: progesterone is usually checked six to eight days after ovulation, around day 21 if you have a 28-day cycle.
Sample Type
A blood sample is needed. Most of the time, blood is drawn from a vein located on the inside of the elbow or the back of the hand.
Collection
The person drawing blood will start by cleaning an area of skin directly over a vein. Next, they will insert a needle into the vein. They will draw blood through the needle into a vial or tube. Then they will send the blood sample to a laboratory for testing. You may feel slight pain or a sting when the needle is inserted.
Turnaround
Results are typically available within 1-2 business days after the laboratory receives the sample.
Understanding your results
Progesterone levels vary significantly depending on menstrual phase, pregnancy stage, and menopausal status. If you're a person who menstruates, your blood progesterone level should be low at the beginning of each menstrual cycle and peak several days after you ovulate. Then it should fall back to low levels, unless you've become pregnant. Typically, day 21 to 23 serum progesterone concentrations of more than 10 ng/mL indicate normal ovulation and concentrations below 10 ng/mL suggest anovulation, inadequate luteal phase progesterone production, or inappropriate timing of specimen collection.
| Population | Reference Range | Notes |
|---|---|---|
| Females (pre-ovulation) | Less than 1.0 ng/mL | Normal range for the beginning of menstrual cycle |
| Females (mid-cycle/luteal phase) | 5-20 ng/mL | Normal range during mid-cycle after ovulation |
| First trimester pregnancy | 11-44 ng/mL | Range during early pregnancy |
| Males and postmenopausal females | Less than 1.0 ng/mL | Normal baseline levels |
Reference ranges shown are general guidelines. Your lab report will include the specific reference range used by the laboratory that processed your sample, which is the authoritative range for interpreting your results.
What does a “Low” result mean?
Lower-than-normal progesterone levels may be associated with irregular menstrual cycles, amenorrhea (absence of menstruation), menorrhagia (heavy periods), PMS, mood changes, and fertility challenges. Low progesterone may indicate not ovulating normally, polycystic ovary syndrome (PCOS), high stress, or perimenopause. During pregnancy, low levels may be linked to ectopic pregnancy, miscarriage or a high risk of miscarriage, or pre-eclampsia. Low progesterone levels can indicate a luteal phase defect, where the corpus luteum does not produce enough progesterone, which can affect the uterine lining's ability to prepare for implantation, potentially leading to difficulties with fertility or early pregnancy loss.
What does a “High” result mean?
Increased progesterone concentrations are occasionally seen with some ovarian cysts, molar pregnancies, rare forms of ovarian cancer, adrenal cancer, congenital adrenal hyperplasia, and testicular tumors. Higher-than-normal progesterone levels may indicate pregnancy, ovarian cysts, elevated stress levels, hormone replacement therapy, and (rarely) ovarian cancer or congenital adrenal hyperplasia. Higher than expected progesterone levels during pregnancy may mean carrying twins or more babies. High progesterone levels may also be a sign of a molar pregnancy, which is an abnormal growth of tissue in the uterus. When levels are elevated: either moderately or slightly: this may suggest hormone supplementation, an underlying health condition, or simple biological variation.
Privacy & confidentiality
All test orders are authorized and results reviewed by an independent, board-certified physician who is not the patient's personal doctor. Understanding fertility and hormone health is deeply personal, and many individuals prefer discretion when testing progesterone levels. LevelPanel prioritizes complete confidentiality throughout the testing process. Results are delivered directly to individuals through a secure online portal and are <u>not reported to your doctor</u> unless you choose to share them. Test results are <u>not part of your medical records</u> and will <u>not appear on insurance statements</u> or explanations of benefits, ensuring complete privacy from employers and insurance providers. The testing process is designed to be discreet and professional. All samples are processed by certified laboratories with strict privacy protocols, and personal information is protected according to healthcare privacy regulations. Whether seeking answers about ovulation, fertility concerns, or general reproductive health, individuals can test with confidence knowing their results remain completely confidential. LevelPanel empowers people to take control of their health information, allowing them to make informed decisions about when and with whom to share their progesterone test results.
Frequently asked questions
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CPT Code: 84144
This test may not be available in: NY, NJ, RI
This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.
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