Skip to content
Christmas Service Update - Click For Full Details
Christmas Service Update - Click For Full Details
Perimenopause banner

Understanding Perimenopause and Recognising the Signs

Perimenopause is a natural yet often challenging phase in a woman’s life, marking the transition toward menopause. Characterised by fluctuating hormone levels, perimenopause brings about a range of physical and emotional changes that can impact daily life. From irregular periods and mood shifts to sleep disturbances and fatigue, the symptoms of perimenopause are varied and can feel overwhelming. However, understanding what’s happening in your body and managing these changes proactively can significantly affect your overall well-being.


One Day Tests is here to support you through this transition with accurate and accessible blood testing for key hormone levels that influence perimenopause symptoms. With the right insights into your hormone health, you can take control of your health journey, gaining clarity and confidence along the way.

Female doctor consultation

What is Perimenopause?

Perimenopause, also known as the menopausal transition, is the period leading up to menopause when a woman’s body begins to undergo hormonal changes that signal the end of reproductive years. It typically begins in a woman’s 40s, although some may start noticing changes in their mid-30s. Perimenopause can last anywhere from a few months to over a decade, with the average duration being about 4 years.

Stages of Perimenopause: Early and Late

Perimenopause is commonly divided into two stages: early and late. Each stage brings its own set of symptoms and hormonal shifts.

  • Early Perimenopause: This initial phase usually begins with subtle changes in menstrual cycles. Periods may become irregular, shorter or longer, slightly lighter or heavier than usual. Hormonal fluctuations, particularly in oestrogen, start to occur, which can lead to mood swings, irritability, and occasional hot flushes. These early signs can feel mild for some, while others may notice more significant changes.

  • Late Perimenopause: In the later stage, periods become even more irregular, and it’s common to go several months without menstruating. Hormone levels fluctuate more noticeably, often dropping to lower levels, which can amplify symptoms. Hot flushes, night sweats, and sleep disturbances tend to become more frequent, and many women experience increased fatigue and even cognitive changes like memory lapses or trouble concentrating. This stage continues until a woman reaches menopause.

Common Signs of Perimenopause

Perimenopause symptoms can vary greatly from one woman to another, but some of the most common experiences include:


  • Irregular Periods: Changes in cycle length, flow, and frequency are often among the first signs.
  • Mood Swings: Hormonal changes can lead to irritability, anxiety, and emotional sensitivity.
  • Hot Flushes and Night Sweats: Sudden feelings of heat, often followed by sweating, are common as oestrogen levels fluctuate.
  • Sleep Disturbances: Hormonal shifts and night sweats can lead to difficulty falling or staying asleep.
  • Fatigue and Low Energy: The physical and emotional effects of perimenopause often lead to increased feelings of fatigue.

Understanding the stages and symptoms of perimenopause can empower you to take proactive steps in managing this transition. One Day Tests’ perimenopause blood test can provide you with insights into your hormone levels, helping you better understand and navigate this important life stage.

Healthy woman on beach

Hormones and Perimenopause

Hormonal balance plays an important role in navigating the physical and emotional changes that come with perimenopause. During this phase, the body experiences fluctuations in key hormones - primarily oestrogen, progesterone, and follicle-stimulating hormone (FSH) - that can lead to various symptoms affecting daily life. Understanding these changes and monitoring hormone levels can make a meaningful difference in managing symptoms and maintaining well-being.

Key Hormones in Perimenopause

  • Oestrogen: Often the most widely recognised hormone associated with perimenopause, oestrogen levels can vary dramatically during this transition. These fluctuations can lead to hot flashes, night sweats, and mood changes. Oestrogen also plays a role in maintaining bone density, heart health, and cognitive function.

  • Progesterone: Typically, progesterone begins to decrease as ovulation becomes irregular. Lower progesterone levels can contribute to symptoms like irregular menstrual cycles, anxiety, and sleep disturbances. Progesterone also has a calming effect on the body, so its decline may lead to increased irritability and disrupted sleep.

  • Follicle-Stimulating Hormone (FSH): FSH levels rise as the body tries to stimulate the ovaries to produce oestrogen. Higher FSH levels can indicate the onset of perimenopause and are often used by healthcare providers to assess where a woman is in the menopausal transition. Elevated FSH is a common indicator of the body’s attempt to adjust to decreasing ovarian function, leading to a cascade of other hormonal changes.
Female doctor with woman

Why Monitoring Hormone Levels Matters

Tracking hormone levels during perimenopause provides valuable insights into your body’s changes and can help identify specific imbalances that might be driving symptoms. Hormone testing can reveal patterns in fluctuations, offering a clearer understanding of symptoms like mood swings, fatigue, and hot flashes. With a perimenopause blood test, you can take proactive measures - whether through lifestyle adjustments, dietary changes, or specific treatments - that can help ease the transition.

The Value of Accurate Hormone Data

Having accurate hormone data enables healthcare providers to help you create personalised management plans that address individual symptoms and needs. For example, understanding oestrogen levels can guide recommendations for diet or supplements that support bone health, while progesterone insights can help tailor approaches for managing sleep disruptions and mood changes. By having a precise picture of hormone levels, you and your healthcare provider can make informed decisions, taking steps that are specifically suited to your body’s current needs.

Why Blood Tests are Important

Perimenopause Blood Test

Feel Confident in Your Perimenopause Journey

Navigating perimenopause can feel overwhelming, but with the right tools and insights, you can take control of your health and well-being. The One Day Tests perimenopause blood test offers a simple, reliable way to understand the hormonal changes in your body. 


By tracking key biomarkers, this test provides the clarity you need to manage symptoms and make informed decisions about your care.
Whether you’re experiencing early symptoms, seeking confirmation of perimenopause, or looking for answers to unexplained changes, our test gives you the data and expert support you need.

Related Articles

Next article CA 125 Blood Test: Ovarian Cancer Diagnosis and Monitoring