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Monitoring Low and High Progesterone Levels

Progesterone is a crucial hormone for women's health, playing a vital role in the menstrual cycle and pregnancy. It regulates the menstrual cycle, supports pregnancy, and maintains overall hormonal balance. Imbalances in progesterone levels can lead to a range of symptoms and health issues, making it essential to monitor and manage these levels effectively.


One Day Tests offers a comprehensive Progesterone Blood Test that can help determine whether ovulation is occurring and if any hormonal imbalances are contributing to menstrual irregularities. With quick turnaround times and advanced health dashboards, One Day Tests helps you stay informed and proactive about your hormonal health.

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The Important Role of Progesterone in the Body

In women, progesterone is produced in the ovaries by the corpus luteum after ovulation. If pregnancy occurs, the placenta takes over its production to sustain the pregnancy. Both men and women produce smaller quantities of progesterone in the adrenal glands. This hormone is essential for maintaining a balanced endocrine system, supporting reproductive functions, and influencing overall health. By regulating menstrual cycles in women and contributing to testosterone production in men, progesterone plays a crucial role in overall well-being.

What Is the Normal Level of Progesterone?

Progesterone levels vary depending on the timing of the test. Levels start to rise midway through the menstrual cycle, continuing to increase for about 6 to 10 days before falling if fertilisation does not occur. During early pregnancy, levels continue to rise.


Normal ranges based on different phases and conditions are as follows:


  • Female (pre-ovulation): Less than 1 ng/mL or 3.18 nmol/L
  • Female (mid-cycle): 5 to 20 ng/mL or 15.90 to 63.60 nmol/L
  • Male: Less than 1 ng/mL or 3.18 nmol/L
  • Postmenopausal: Less than 1 ng/mL or 3.18 nmol/L
  • Pregnancy 1st trimester: 11.2 to 90.0 ng/mL or 35.62 to 286.20 nmol/L
  • Pregnancy 2nd trimester: 25.6 to 89.4 ng/mL or 81.41 to 284.29 nmol/L
  • Pregnancy 3rd trimester: 48 to 150 ng/mL or more, or 152.64 to 477 nmol/L or more
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Day 21 Progesterone Level Testing

Day 21 testing plays a vital role in fertility assessments by measuring progesterone levels at a key point in the menstrual cycle. Typically conducted around day 21 in a 28-day cycle (about 7 days before the next period), this test coincides with peak progesterone production, confirming ovulation and evaluating the luteal phase. While the length of the follicular phase can vary among women, the luteal phase consistently lasts about 14 days. Your peak progesterone level should occur seven days after ovulation and seven days before your period starts.


Adequate progesterone is essential for preparing the uterine lining for embryo implantation and supporting early pregnancy. Monitoring progesterone allows healthcare providers to identify and address potential fertility issues, improving the chances of conception. This test also helps determine if progesterone levels are sufficient to maintain a potential pregnancy, as low levels can impede implantation and overall fertility.

Symptoms of Low Progesterone Levels

Symptoms in Women


Low progesterone levels can lead to a variety of symptoms that affect menstrual and reproductive health. These symptoms include irregular menstrual cycles, where periods may become erratic or infrequent. Women might also experience heavy bleeding and premenstrual syndrome (PMS) symptoms such as mood swings, bloating, and breast tenderness. Additionally, low progesterone can make it difficult to maintain a pregnancy, increasing the risk of miscarriage and fertility issues.

Illnesses Associated with Low Progesterone Levels

Low progesterone levels in women can lead to several health conditions:


  • Infertility: Progesterone is essential for preparing the uterus for the implantation of a fertilised egg. Low levels can prevent successful implantation, leading to infertility.

  • Miscarriage: Adequate progesterone is crucial for maintaining pregnancy. Insufficient levels can lead to early pregnancy loss.

  • Polycystic Ovary Syndrome (PCOS): Women with PCOS often have hormonal imbalances, including low progesterone, which can cause irregular menstrual cycles and infertility.

  • Menstrual Disorders: Low progesterone can cause heavy bleeding, irregular periods, and severe PMS symptoms.
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Illnesses Associated with High Progesterone Levels

High progesterone levels in women can be linked to several health conditions:



Monitoring and maintaining balanced progesterone levels is crucial for overall health and well-being. One Day Tests offers a comprehensive progesterone blood test to help you keep track of your hormone levels and address any imbalances effectively.

Our Progesterone Blood Test

Measure Your Progesterone Levels With One Day Tests

Regular blood testing for progesterone levels is crucial for maintaining hormonal balance and overall health. By monitoring these levels, you can detect imbalances early and address potential health issues before they become severe.


One Day Tests offers a comprehensive progesterone blood test, providing insights on whether ovulation is occurring and if there are any hormonal imbalances contributing to menstrual irregularities. Get in touch by phone at 0845 527 07 67, email us at hello@onedaytests.com, or message us on WhatsApp for more information.

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