Female Hormones 101

Growing up you’re told how easy it is to get pregnant and how every care should be taken to avoid it. Then as an adult you finally want to become pregnant only to find how difficult it can be!

It turns out you actually only have a short window when you can get pregnant in your monthly cycle. On top of that, many factors contribute to how fertile you are and how difficult it will be to get pregnant. Things like, do you still ovulate? What are your FSH levels? What about progesterone and estrogen? Add your AMH ( how many eggs you have left) and it suddenly seems to be a complicated process.


Where to start?

To start with, visit your Dr and get them to run some tests to check your fertility.

Make sure the tests include:

  1. AMH (Anti-Mullerian Hormone) indicates your ovarian reserve, i.e. what your egg stores are.
  2. FSH (Follicle-stimulating hormone) is responsible for stimulating the growth and maturation of your egg
  3. Oestradiol this hormone is triggered by FSH and they both work together to develop the egg follicle further.
  4. Progesterone helps control the amount of FSH released by the pituitary gland. It is also responsible for creating the environment where the egg implants into the uterus. We call this the sticky hormone.
  5. LH (luteinizing hormone) plays different roles in the two halves of the menstrual cycle. In weeks one to two of the cycle, LH is required to stimulate the ovarian follicles in the ovary to produce oestradiol. Then, around day 14 of the cycle, a surge in LH causes the ovarian follicle to tear and release an egg from the ovary.

Testing Schedule:

Days 2-3: You need to take AMH, FSH, Oestradiol and LH on days 2 or 3 of your cycle, 2-3 days after your period starts.

Day 21: The Progesterone test is typically tested on day 21 to check if you have ovulated.

Ask your doctor to order other tests to check general health with the knowledge that yyou want to conceive. These included: Complete blood count, Diabetic profile, Thyroid function test, Rubella antibodies, STD, Hepatitis B, Hepatitis C, C-reactive protein, Liver function test, Iron, Hepatitis C, HIV, Serum B12 and folate.

Understanding your result

You have gone to the Dr, had your tests and received your results. Some doctors may not explain the results to you how you would like, so below is information about your test results.

AMH

The AMH is your anti-müllerian hormone, which tells you the level of eggs left in your body (your egg reserve). Unfortunately, if this is low, there is nothing that you can do about it. Kat and I had low AMH levels for our age; however, we could still conceive. Low does not mean any.

A high result may indicate that you have PCOS; however, this will be detected in conjunction with other hormones.

See the below graph on AMH levels vs your age

FSH

Follicle Stimulating Hormone (FSH) There are different views on what would be classified as the “normal” range; however, most reports indicate that anything above 15 is considered “abnormal.” On average, women in the 10-to-15 range have a 50% lower success rate of falling pregnant than others in their age group with FSH levels of 9.5 or below.

High FSH Levels

If FSH levels are abnormally high, the body needs to work harder to produce more FSH to stimulate egg maturation and ovulation. This could indicate a less than ideal quality and quantity of eggs in the ovaries. This is a normal part of ageing and is more common in women age 38 or older. However, even young women can have high FSH levels. So if you have a high FSH, don’t worry. This doesn’t mean you can’t have a baby; you may have more difficulty and potentially need IVF treatment. The FSH test is used in conjunction with other tests that look at LH, estradiol, and progesterone levels to determine a person’s ovarian reserve.

High FSH levels may indicate:

  • A loss of ovarian function, or ovarian failure menopause
  • polycystic ovarian syndrome is a condition in which a woman’s hormones are out of balance, causing ovarian cysts
  • A chromosomal abnormality, such as Turner’s syndrome, occurs when part or all of one of a woman’s X chromosomes is missing

Low FSH Levels

FSH levels can also be abnormally low. This is usually combined with low LH levels and may indicate a problem with the functioning of the pituitary gland or hypothalamus, which are two parts of the brain that play essential roles in ovulation. Anything lower than 3 is considered low.

Oestradiol

Ranges for estradiol:

Phase Oestradiol (pmol/L)
Early follicular < 300
Ovulatory surge < 500 – 3000
Luteal surge 100 – 1400
Post-menopausal < 200

High estradiol levels indicate that you might have a problem with your ovarian reserve. It could also mean that the estradiol is suppressing FSH. Either of these things could mean that you will have more trouble getting pregnant, more trouble ovulating (even with treatment), and reduced success with IVF.

If your estradiol levels are low, it can indicate polycystic ovary syndrome (PCOS) or hypopituitarism.

Progesterone

Stage Progesterone level (ng/mL)
pre-ovulation < 0.89
ovulation ≤ 12
post-ovulation 1.8–24

High levels of progesterone typically don’t cause any adverse health effects. Having high levels of progesterone won’t cause any negative impact on your health. This is because progesterone levels naturally reach high levels during pregnancy.


Low progesterone levels can affect both menstruation and fertility. Progesterone helps to promote a suitable environment for a fertilized egg. When progesterone levels are low, it’s harder for a fertilized egg to develop and grow.

Low levels of progesterone can also contribute to certain conditions, including:

  • Absence of menstruation
  • Miscarriage
  • Poor ovarian function

If you have low progesterone, there are treatment options available so speak to your GP about them.

LH

With your LH results, they look for the LH peak to see that you are ovulating. During ovulation, your LH hormone will peak, which releases the Egg. You can check you are ovulation by using our ovulation tests.

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