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Are you in the perimenopause? Find out with Female Hormone Mapping™


Perimenopause can start when a woman is in her early 40s causing wide ranging symptoms such as irregular periods, night sweats, brain fog, memory issues and anxiety. Our ground-breaking new perimenopause test is different to other tests as it predicts how your four key female hormones fluctuate over your entire menstrual cycle rather than just a single day. This will show the complex interplay between these hormones which enables us to confirm perimenopause – something a single day, static test carried out by your GP is unable to show.



Because no two women are the same, Female Hormone Mapping™ provides unique personalisation and unparalleled insight in your hormone network.

We do this by combining blood analysis with medical expertise and mathematical modelling, to map your hormones across your entire menstrual cycle to identify if they are fluctuating as expected for your age.

You’ll get a detailed, personalised report with next step actions from Forth’s expert endocrinologist, Dr Nicky Keay, who is also a member of the British Menopause Society. The report will tell you:

  • If you have started the perimenopause
  • Your unique ovarian response score indicating how well your ovaries are responding to your control hormones – an indicator of perimenopause 
  • How your hormones are impacting how you feel throughout your menstrual cycle
  • Confirmation if ovulation has occurred
  • Clear next steps based on your results and clinical analysis from Dr Nicky Keay
  • Option to book a follow-up appointment with Dr Nicky Keay to discuss your report (this is an additional cost to the test).

View a demo of the report you’ll receive.

Taking the test

This is a double test kit. Blood samples to be collected on day 14 and day 21 of your menstrual cycle. Not suitable for women on hormonal contraception, HRT or women with cycles less than 22 days or more than 40 days.

How Does Female Hormone Mapping™ Help?

Find out if your symptoms are due to the perimenopause.

The perimenopause can cause a large range of symptoms, and no two women’s experience will be the same. Female Hormone Mapping™ is useful for women over 40 who want to know if the symptoms they are experiencing may be due to the perimenopause. In addition to identifying a drop in the ovarian hormones and a rise in the control hormones, which is characteristic of the perimenopause, we’ll also measure any decline in ovarian responsiveness, through our unique FORM score.

FORM (Forth Ovarian Response Metric) evaluates how well your hormone network is functioning. Presented as a number between 1-100, this score can be used to chart the decline in ovarian responsiveness over time. This can help with decisions regarding the use of HRT.

Once perimenopause has been confirmed, your personalised report will provide positive next steps on how to manage symptoms and look after your longer-term health.

Hormones play a vital role in physical and mental health. Your female hormone variations are personal to you which is why it can be challenging to find answers that are relevant to you as an individual woman. Female Hormone Mapping™ provides you with individualised insights, personalised medical explanation and evidence-based advice

Dr Nicky Keay
Chief Medical Officer & endcrinology expert

About the Biomarkers

Gain insight into all four hormones essential to the female hormone network by testing on day 14 and day 21 of your cycle.

Progesterone is used to measure if a woman has ovulated. Levels start to raise following ovulation and is therefore more likely to affect how you feel in the second half of your cycle. Progesterone levels will start to decline over the age of 40.

Oestradiol is the main form of Oestrogen in women and levels peak just before ovulation. As oestradiol is the dominant in follicular phase, it is more likely to influence how a woman feels in the first half of their cycle. Oestradiol levels will start to decline when entering the perimenopause.

Follicular Stimulating Hormone is one of the two control hormones which control the production of progesterone and Oestradiol. FSH increases steadily during the first half of the cycle stimulating the development of the follicle prior to ovulation. FSH become consistently raised as women transition towards the menopause.

Luteinising Hormone works alongside FSH to control the production of Progesterone and Oestradiol. LH remain low for most of the cycle but surges sharply to trigger ovulation mid-cycle.

What's included in the test?

Female Hormone Mapping™ includes a double blood test kit which measures the four key fertility hormones, at two points within the same cycle – day 14 and day 21.

What's Included?
*Introductory Offer T&Cs: Excludes the cost of a phlebotomy test. Cannot be used in conjunction with any other offer.

Hormones and the Perimenopause

The perimenopause is the time leading up to menopause and lasts an average of four years or longer. Although it is a natural part of a woman's life, the changes in hormones during this time can have a huge impact on a woman's health and wellbeing, and cause a wide range of symptoms.

The main hormones that change during perimenopause are the two ovarian response hormones oestrogen, and progesterone, and the control hormones follicle-stimulating hormone (FSH) and luteinising hormone (LH).

As a woman starts the perimenopause phase and continuing through to menopause, the levels of oestrogen and progesterone slowly decline as levels of FSH and LH rise.

women's hormones over time


Taking control of your health has never been simpler.

Frequently asked Questions

Here are some of the most frequently asked questions. If you need anything else try our help section.

Female Hormone Mapping™  measures the four key female hormones. These are Oestradiol (the main form of Oestrogen), Progesterone, Follicular Stimulating Hormone (FSH) and Luteinising Hormone (LH).

No, our algorithm will adjust your curves to the length of your personal cycle, so it is important that you collect your samples as close to day 14 and 21 as possible, even if you have a longer or shorter than average cycle.

If your day 14 or 21 falls on a Friday, we recommend you collect your sample the day before. If your day 14 or 21 falls over the weekend, collect your sample on the following Monday and remember to post in a priority post box in time for that day’s collection.

Follicular Stimulating Hormone (FSH) and Luteinising Hormone (LH) are known as the control hormones and are produced by the pituitary gland. These hormones control the production of the ovarian response hormones, Oestradiol and Progesterone. 

Oestradiol (the main form of Oestrogen) and Progesterone are ovarian response hormones which are produced by the ovaries. Their production is stimulated by the control hormones FSH and LH. If the control hormones are low, then the ovarian response hormones are also likely to be low. The exception to this is in later life (over 40) when the control hormones start to rise as ovarian responsiveness starts to decline i.e. the transition towards the menopause.

The Forth Ovarian Response Metric (FORM) is a unique and innovative evaluation of the functioning of the hormone network. This score takes into account all your hormone results rather than looking at any one in isolation. A score above 75 suggests a healthy ovarian response. Women over 40 can expect to see a decline in their ovarian response score as they enter the perimenopause and approach the menopause.

Female hormones, particularly the response hormones, have far reaching effects on a woman’s wellbeing. They are essential not only to the reproductive system but also the nervous system, musculoskeletal system, the digestive system, the cardiovascular system, the immune system and metabolism (that’s quite a list!).  So you can see why healthy hormones are important throughout a woman’s life not only when wanting to start a family. In addition, the rise and fall of the ovarian hormones progesterone and oestradiol can influence how you feel throughout your cycle. Understanding how your hormones fluctuate can therefore help you to put strategies in place so you can feel at your best throughout your cycle as well as protecting your long term health.

Hormones can be influenced by lifestyle behaviours such as sleep, stress, nutrition and exercise. That’s why we give you tips and an action plan based on your results of the things you can do to improve your hormone levels and your quality of life.

Any hormonal contraception will mask your natural hormone levels. This product has been specifically designed for those who have naturally occurring cycles.