Why Every Woman 35-50 Needs More Than a Standard Blood Test (And Exactly What to Ask For Instead)
You Are Not Imagining It. You Are Not Depressed. You Are Not Just Getting Older. You Are Under tested.
At some point in your late thirties or forties, something shifted.
Maybe it was the sleep. Maybe it was the weight that appeared from nowhere and refused to leave no matter what you did. Maybe it was the anxiety that started arriving at 3am like it owned the place, or the brain fog that made you feel like you were thinking through wet concrete. Maybe it was the version of yourself that used to have energy, a libido, and a reason to bounce out of bed on a Sunday and at some point you feel like you're not you any more. The real you has disappeared.
So you go to your GP. They ran some bloods. They called to say everything looks fine. You're told theres no point testing hormones.
This feels awful. because you’re not fine. And the reason your results keep coming back normal is not because nothing is wrong. It is because nobody has run the right tests.
I am a clinical naturopath and nutritionist who works with women in perimenopause across Australia. When women come to me with ALL the symptoms here are some of the tests I run for this particular window of life. It is what I wish every Australian woman between 35 and 50 knew to ask for.
Do Any of These Sound Like You?
Before we get into the testing, I want you to read this list slowly.
You are exhausted in a way that sleep does not fix.
You wake up tired even after eight hours. Y
ou are gaining weight around your middle despite eating well and exercising, and nothing is shifting it.
Your sleep is broken…. you fall asleep fine but wake at 2 or 3am and lie there with your mind racing.
You feel anxious for no clear reason, particularly in the evenings or early mornings.
Your mood swings feel disproportionate to what is actually happening.
You have lost your libido and it does not feel like a relationship issue, it feels physical.
Your periods have changed, heavier, more painful, more irregular, or closer together.
You have heart palpitations that come out of nowhere.
Your hair is thinning or falling out more than it used to. Your skin is drier. You feel cold when everyone else is fine.
You are losing muscle tone even though you are still training.
Your recovery from exercise is slower.
You feel bloated most of the time.
Your concentration is not what it was.
You feel flat, unmotivated, and like a version of yourself you do not fully recognise.
If you read that list and felt seen, I want you to know something important. You are not imagining it. You are not depressed. You are not just getting older. You are experiencing a hormonal shift that the Australian medical system, like most medical systems globally, has historically done very little to investigate properly.
The standard blood panel your GP runs, a full blood count, cholesterol, TSH, and fasting glucose is designed to detect diagnosable disease. It is not designed to catch a body that is quietly losing hormonal ground across a decade. It will not show you what is happening to your oestrogen, progesterone, testosterone, cortisol, iron stores, or vitamin D. It answers whether you have crossed into illness. It does not answer why you feel terrible.
That is what this article is for.
Before We Look at Results. What Does "Normal" Actually Mean?
This is something I explain to every single client before we go through their pathology, because it changes everything.
The reference range on your blood test report is a population statistic. It reflects the middle 95 percent of people included in that particular lab's dataset and that dataset may include people who are already unwell, already managing chronic conditions, or simply not thriving. Sitting inside the reference range means you are not an outlier. It does not mean you are well.
Risk begins long before a value turns red. This is true for insulin, for thyroid markers, for iron, for vitamin D, and for sex hormones. I use two sets of numbers for every marker. The standard range is what your pathology report will show. The optimal range is where the research shows that brain, bone, cardiovascular tissue, hormones, and metabolism are actually protected for the long term.
Part One: Metabolic Health
Fasting Insulin
This is the most important metabolic marker I run, and the one almost never included in a standard Australian blood panel.
Fasting insulin tells me how hard your pancreas is working to keep your blood sugar stable. It is a direct measure of insulin sensitivity, and it is the earliest warning signal for metabolic dysfunction, research shows it becomes measurable more than a decade before blood glucose ever looks abnormal. That is ten years of drift that a standard panel completely misses.
Perimenopause and insulin resistance are deeply connected. As the ovaries age, women become progressively more insulin resistant. This is the underlying biology behind the weight that will not shift, the belly fat that appears seemingly overnight, the afternoon energy crashes, the carbohydrate cravings, and further down the track the increased risk of type 2 diabetes, cardiovascular disease, and dementia.
If your fasting insulin is creeping up, everything else becomes harder…. hormones, sleep, weight, mood. It is often the first domino.
Part Two: Ovarian Hormones
These are the markers that tell me where you are in the hormonal arc of perimenopause. If you are still cycling, timing is everything. Draw these on day 2, 3, or 4 of your cycle, day 3 is ideal. If your cycle is irregular or has stopped, draw any day and interpret alongside your symptoms.
Follicle-Stimulating Hormone (FSH)
FSH is the signal your brain sends to your ovaries to recruit and mature an egg each cycle. As ovarian reserve declines, the brain has to send a louder signal. Rising FSH is one of the earliest biological signs that the perimenopause transition is underway often years before your periods become irregular or the word perimenopause has ever been mentioned to you.
A day 3 FSH climbing up tells me you are in early perimenopause, whether or not anyone has said so.
Oestradiol (E2)
Oestradiol is the dominant oestrogen of your reproductive years and it is not just a reproductive hormone. It governs your brain, your bones, your skin, your cardiovascular health, your mood, your sleep architecture, and your libido. When it starts to fall, everything it governs starts to drift with it.
What people don't always realise is that oestrogen fluctuations in perimenopause don't just affect reproductive function. Oestrogen has direct effects on insulin signalling and blood sugar regulation, which is part of why weight becomes so much harder to manage in this decade. It also influences the functioning of the thyroid, the hypothalamus, and the anterior pituitary meaning that when oestrogen starts to fluctuate erratically, you can see downstream effects across multiple systems simultaneously. The brain fog, the mood instability, the temperature dysregulation — these are not separate problems. They are often one problem wearing many faces.
Oestradiol drawn on a random day during perimenopause is largely noise, it fluctuates dramatically. Drawn on day 3, it is meaningful.
Anti-Müllerian Hormone (AMH)
AMH is the most reliable marker of ovarian reserve available through standard serum testing. Unlike most hormones, it does not fluctuate with your cycle, which makes it uniquely useful. It reflects how many follicles you have remaining your biological runway.
A low AMH in your late thirties or early forties changes what I recommend around the timing of hormonal support and bone protection. It is information, not a verdict.
Progesterone
Progesterone is the calming hormone. It is the one that allows you to sleep through the night, quiets the nervous system, and balances oestrogen in the body. It is also the first hormone to decline, typically in the late thirties, years before anyone identifies a hormonal problem.
Low progesterone looks like: waking at 3am, anxiety in the second half of your cycle, breast tenderness, heavy periods, feeling wired but exhausted, and difficulty staying asleep.
When to draw: approximately 7 days after ovulation, the mid-luteal phase. For a 28-day cycle, roughly day 21 but time it from ovulation, not the calendar. This can be tricky to predict if you are not familiar with when you ovulate. Don’t feel bad about this. A lot of women aren’t sure about when they’re ovulating. We can work this out together and run tests over a few months.
Drawn at the wrong time, this result tells you nothing. Timing is everything.
What progesterone decline actually does to your body is more significant than most people appreciate. Progesterone converts in the brain to a compound called allopregnanolone, which calms GABA receptors, the same receptors that regulate anxiety, sleep onset, and stress response. When progesterone falls, allopregnanolone falls with it, and the nervous system loses one of its primary settling mechanisms. This is the biochemical explanation for the anxiety that arrives in the second half of your cycle, the inability to switch off at night, and the feeling of being wired and depleted at the same time.
Progesterone also has direct bone-forming activity. It binds to receptors on osteoblasts, the cells responsible for building new bone. So when progesterone declines, bone density can start to decrease even before oestrogen drops significantly which is why I take bone health seriously in women in their late thirties and early forties, not just post-menopause. And it plays a stabilising role in the HPA axis, the stress response system, which means low progesterone makes the body more reactive to stress and less able to recover from it.
A note on progesterone support: if hormonal support becomes part of your plan, it matters enormously whether you are using micronized progesterone (bioidentical, identical in structure to what your body produces) or a synthetic progestin. These are not the same thing. Synthetic progestins, which are derived from testosterone and used in hormonal contraceptives and some forms of HRT, do not replicate the full range of progesterone's activity in the body. They do not have the same calming effect on GABA receptors, they do not carry the same bone-protective properties, and research shows they can attenuate the beneficial cardiovascular effects of oestrogen. Micronized progesterone, by contrast, supports HDL cholesterol, has a more favourable cardiovascular profile, and is safer for breast tissue. This is a conversation worth having with your practitioner.
Part Three: Androgens
Most women I see have never had their testosterone checked. The truth is, women produce testosterone, women need testosterone, and women lose roughly half of it by the time perimenopause arrives. The symptoms that follow are low libido, muscle loss despite training, flat motivation, emotional numbness, slow recovery are routinely misattributed to stress, depression, or simply getting older.
They are not inevitable. They are measurable.
Free Testosterone
Free testosterone is the biologically active form, the testosterone that is actually available to your tissues.
DHEA-S
DHEA-S is the adrenal precursor that fuels both testosterone and oestrogen production. It declines with age and drops sharply with chronic stress. I consistently see low DHEA-S in women who have been running on empty for years, and in women with autoimmune conditions.
Sex Hormone Binding Globulin (SHBG)
SHBG is the carrier protein that holds testosterone in reserve, making it unavailable to your tissues. If SHBG is elevated, your total testosterone can look completely normal while almost none of it is actually working in your body. Without this number, your testosterone results may not be telling the whole story.
Part Four: Thyroid - The Panel Behind the Panel
Thyroid dysfunction is extremely common in women moving through perimenopause, and it is consistently underdiagnosed. The standard TSH test alone misses most of it.
Hashimoto's thyroiditis, the autoimmune condition that drives most hypothyroidism in women can be actively attacking the thyroid gland for a decade before TSH ever moves. Symptoms of thyroid dysfunction overlap almost completely with perimenopause: fatigue, weight gain, brain fog, hair loss, feeling cold, low mood, poor sleep, muscle aching. This overlap is why so many women have it missed.
TSH
Standard reference: 0.4 to 5.0 mIU/L Optimal: 0.3 to 2.5 mIU/L
A TSH sitting at 4.5 is technically within range. Clinically, for a symptomatic woman in her forties, I am not comfortable there. Not by a long way to be honest. Under 2.
Free T4
T4 is the storage form of thyroid hormone. It must be converted to the active form — T3 to have any effect on your cells.
Free T3
Free T3 is the active thyroid hormone, the form your cells actually use. If no one is measuring this, no one is seeing what your thyroid is actually doing at a cellular level.
Reverse T3
Under chronic stress, the body converts T4 into reverse T3, an inactive form that occupies thyroid receptors without activating them. You feel hypothyroid. Your TSH looks normal. This is the marker that reveals that pattern.
TPO Antibody and Anti-Thyroglobulin Antibody
These are the Hashimoto's markers. Any elevation means your immune system is attacking your thyroid. If antibodies are never checked, the autoimmune process driving your symptoms is never found.
Part Five: Cortisol. The Rhythm Matters More Than the Number
Cortisol should rise sharply in the morning and gradually fall through the day, reaching its lowest point at night so your body can sleep, repair, and restore. When that rhythm breaks through chronic stress, overtraining, undereating, poor sleep, or the HPA axis dysregulation so common in perimenopause, everything breaks with it.
The wired-but-tired feeling. The 3am waking. The belly fat that will not shift. The afternoon crash. The heightened anxiety. The sense of running perpetually on empty. These are not character flaws. They are cortisol rhythm problems.
Morning Cortisol
A morning blood draw gives me a starting point. But cortisol is a rhythm hormone, and what I really need to see is the full shape of your day. When symptoms strongly suggest HPA axis dysregulation, I use either the DUTCH Plus dried urine test or the Adrenal Stress Index a four-point saliva test that maps the full daily cortisol curve. Both are available through functional pathology services in Australia and can be collected at home.
Part Six: Iron. The Most Commonly Missed Driver of Fatigue in Women
Iron deficiency is one of the most widespread and most consistently undertreated conditions I see in women in their thirties and forties. It is also one of the most frequently missed, because the standard iron test, a serum iron and haemoglobin tells only part of the story.
A woman can have completely normal haemoglobin and still be functioning on critically low iron stores. She will be exhausted. She will have brain fog. Her hair will be falling out. She will feel breathless on exertion. Her concentration will be poor. She will recover slowly from exercise. And her blood test will come back normal.
This is why I run a full iron panel, not just a single marker.
Serum Ferritin
Ferritin is your iron storage protein, the warehouse, not the current supply. It is the most important iron marker for understanding how your body is actually doing. This is the marker most GPs either do not run, or interpret far too conservatively.
Here is the thing about ferritin. A result technically within range at most Australian labs. Clinically, that woman is running on empty. I have seen women with ferritin in the teens presenting with profound fatigue, significant hair loss, and poor cognitive function and being told their iron is fine. It is not fine. The threshold for symptoms is much higher than the lower limit of the reference range.
Serum Iron
This reflects the amount of iron currently circulating in your blood, a snapshot, not the full picture, but useful in context.
Transferrin
Transferrin is the protein that carries iron through the bloodstream. When iron stores are low, transferrin rises as the body tries to capture every available iron molecule. Elevated transferrin alongside low ferritin is a clear signal of iron deficiency even when haemoglobin looks normal.
Transferrin Saturation
Transferrin saturation tells me what percentage of your iron-carrying capacity is actually being used. Low saturation below 20 percent indicates iron deficiency even when other markers are borderline.
Full Blood Count with MCV and MCH
A full blood count includes red blood cell size (MCV) and haemoglobin content per cell (MCH). In iron deficiency, red blood cells become small and pale, low MCV and low MCH. This is one of the late signs of iron deficiency, meaning the problem has often been present for a long time before the FBC changes. But it is still worth including as part of the complete picture.
Why Iron Matters So Much in Perimenopause
Women in perimenopause are at high risk of iron deficiency for several reasons. Periods frequently become heavier during the perimenopause transition, increasing monthly blood loss. Gut absorption can be compromised by stress, low stomach acid, and dysbiosis. Inflammation which increases during perimenopause, raises hepcidin, a hormone that actively blocks iron absorption regardless of dietary intake.
The result is that many women in their late thirties and forties are running on iron stores that are technically within range but nowhere near optimal and feeling every bit of it.
Part Seven: Vitamin D. The Sunshine Deficiency Nobody Expects in Australia
Vitamin D deficiency in Australia feels counterintuitive. We live in one of the sunniest countries in the world. And yet deficiency is widespread, particularly in women.
The reasons are straightforward. We are appropriately cautious about sun exposure and UV damage. We cover up, wear SPF daily, and avoid the midday sun, all sensible things to do for skin health. The result is that many Australian women, especially those working indoors, living in southern states, or consistently wearing sun protection, are not getting anywhere near enough sun exposure to maintain healthy vitamin D levels.
Vitamin D is not just a bone nutrient. It is a hormone precursor that influences immune function, mood regulation, muscle strength, thyroid health, insulin sensitivity, and inflammatory response. Low vitamin D in perimenopause contributes to bone loss, worsens fatigue and low mood, increases infection susceptibility, and appears to play a role in hormone dysregulation.
25-OH Vitamin D (25-hydroxyvitamin D)
This is the marker to measure vitamin D status. It reflects your body's overall vitamin D stores.
A result of 52 nmol/L is technically within the Australian reference range. Clinically, for a woman experiencing fatigue, low mood, muscle aching, and immune vulnerability, that is not where I want her to be. The research on optimal immune and hormonal function consistently points to the 100 to 150 nmol/L range.
Vitamin D testing in Australia is covered by Medicare when ordered by your GP with clinical justification. It is one of the most straightforward and cost-effective markers on this entire panel to check and to correct.
Part Eight: Advanced Testing for a Deeper Picture
For women where the standard panel raises more questions, or where symptoms suggest something more complex is going on, there are three additional tests I use regularly in my practice. All are available in Australia, all can be collected at home.
HuMAP Plus Neurotransmitters
The HuMAP Plus Neurotransmitters is a 24-hour urine test that provides a comprehensive picture of sex hormones, adrenal hormones, and neurotransmitter function. For women experiencing anxiety, low mood, poor sleep, or flat motivation alongside hormonal symptoms, this test shows how the hormonal and nervous systems are interacting, whether serotonin, dopamine, noradrenaline, and GABA pathways are balanced, depleted, or dysregulated. It is the test I reach for when a woman's emotional and mental health symptoms are not shifting despite good foundational work. Collection kits are available across Australia through a practitioner referral.
EndoMAP (NutriPATH)
The EndoMAP is a dried urine test that goes significantly further than standard hormone blood testing. It maps the full steroid hormone cascade, how your body is producing and, critically, metabolising oestrogen, progesterone, androgens, and cortisol.
This matters because oestrogen is not a single substance. It is metabolised down multiple pathways, and some metabolites carry significantly higher health risks than others. The 2-hydroxy pathway is generally considered protective. The 4-hydroxy and 16-alpha-hydroxy pathways carry different risk profiles, particularly in relation to breast tissue. Standard blood tests tell you how much oestrogen you have. The EndoMAP shows you what your body is doing with it.
The EndoMAP also includes endocrine-disrupting compounds, BPA, PFAS, heavy metals including lead, mercury, arsenic, and cadmium and nutritional organic acids giving insight into mitochondrial function and gut health. For women on hormone replacement therapy, it is an invaluable safety monitoring tool. Collection is done at home using dried urine strips.
Complete Microbiome Mapping
This one surprises women when I bring it up in a conversation about hormones. The connection becomes clear once you understand the gut-hormone axis.
Your gut microbiome plays a direct role in oestrogen metabolism through a group of gut bacteria known as the estrobolome. These bacteria produce an enzyme called beta-glucuronidase, which can reactivate oestrogen that the liver has already processed for excretion, sending it back into circulation rather than clearing it. When the microbiome is healthy, oestrogen is cleared properly. When it is disrupted — through antibiotics, chronic stress, poor diet, or dysbiosis, oestrogen recirculates, creating a pattern that looks like oestrogen dominance.
Oestrogen dominance looks like: heavy or prolonged periods, breast tenderness, bloating, weight gain around the hips and thighs, worsening PMS, mood instability in the second half of the cycle. For women whose hormonal symptoms are not resolving despite good hormonal support, the gut is often where I look next.
The Complete Microbiome Mapping test analyses the full spectrum of gut bacteria, fungi, parasites, viruses, and key digestive markers from a single stool sample collected at home.
Part Nine: How You Clear Oestrogen Matters as Much as How Much You Have
This is something I talk about with almost every perimenopausal woman I see, and it is almost never discussed in conventional medicine. We measure oestrogen levels. We rarely look at oestrogen metabolism, how your body processes and eliminates it once it has done its job.
Here is why it matters. Oestrogen is not a single substance. Once it has circulated through the body, it gets broken down by the liver into different metabolites, and those metabolites are not all equal. There are three primary pathways:
The 2-hydroxy pathway produces metabolites that are relatively weak and considered protective. This is the pathway you want dominant.
The 4-hydroxy pathway produces more reactive metabolites that can interact with DNA and are associated with increased risk to breast and other hormone-sensitive tissue.
The 16-alpha-hydroxy pathway produces stronger, more stimulating metabolites that can drive oestrogen-sensitive tissue overgrowth.
A standard blood test tells you your oestrogen level. It tells you nothing about which of these pathways is dominant, or whether you are clearing oestrogen efficiently at all. This is why the EndoMAP I mentioned above is so valuable it maps these pathways directly.
But beyond testing, there are nutritional and lifestyle factors that actively support healthy oestrogen clearance, and this is where clinical nutrition becomes genuinely powerful.
The liver processes oestrogen in two phases. Phase one converts active oestrogen into its metabolites. Phase two packages those metabolites for excretion. For both phases to work well, the liver needs adequate nutrients, B vitamins, magnesium, glutathione and enough fibre in the diet to ensure those packaged metabolites actually leave the body through the bowel rather than being reabsorbed.
Compounds found in cruciferous vegetables like broccoli, cauliflower, kale, and Brussels sprouts, particularly DIM (diindolylmethane) and sulforaphane, support the liver's phase one detoxification and actively encourage the 2-hydroxy pathway over the more problematic alternatives. This is why brassicas are not just a general health recommendation. For women with oestrogen dominance symptoms or a family history of hormone-sensitive conditions, they are genuinely therapeutic.
Calcium d-glucarate is another compound worth knowing about. It inhibits an enzyme in the gut called beta-glucuronidase, which is the same enzyme that can reactivate already-processed oestrogen and send it back into circulation. Keeping beta-glucuronidase activity in check means oestrogen that the liver has already cleared actually leaves the body. Fermented foods, fibre, and a healthy microbiome all help here too which brings us back, again, to the gut.
What I want women to take from this is not a supplement list. It is an understanding that oestrogen clearance is an active process that depends on a functioning liver, a healthy gut, and adequate nutritional support. When those foundations are in place, the hormonal picture almost always improves.
What to Do With All of This
Ask for the tests listed here. Book an appointment with me to run further tests and really assess where things are at based off YOU not someone elses experience.
Most standard markers fasting insulin, FSH, oestradiol, progesterone, testosterone, DHEA-S, SHBG, full thyroid panel including antibodies, full iron studies, ferritin, and vitamin D can be ordered through your GP or specialist. Many are covered by Medicare when there is clinical justification. The functional tests, HuMAP, EndoMAP, Complete Microbiome Mapping require a practitioner referral and are self-funded, but they provide a depth of information standard pathology cannot.
When your results come back, we are not just accepting the ranges printed on the report. We want optimal. Track them over time. A single result is a snapshot. Results across one year, two years, five years show you the direction your health is moving and direction is where the real clinical picture lives.
If you are somewhere between 35 and 50 and your annual check-up has consisted of a cholesterol panel, a full blood count, TSH, and fasting glucose, you have not yet had the investigation this decade of your life deserves. The biology you build in your forties shapes what your sixties look like. The window to act is now, and it starts with knowing what to measure.
You have been accurately reading your body for years. It is time someone ran the tests to prove it.
Frequently Asked Questions
Can I get these tests through my GP in Australia? Most of the standard markers on this list can be ordered through your GP. Some, particularly fasting insulin and the full thyroid panel including antibodies may require you to specifically ask for them, as they are not always included in a routine check-up. The functional tests (HuMAP, EndoMAP, Complete Microbiome Mapping) require a naturopath or integrative practitioner referral.
Are these tests covered by Medicare? Many standard pathology markers are Medicare-covered when ordered by a GP with clinical justification. Ferritin, vitamin D, thyroid antibodies, and sex hormones may have specific criteria. The functional tests are self-funded. Your practitioner can advise on what is likely to be covered based on your individual situation.
When is the best time to get hormone tests done? If you are still cycling, ovarian hormones (FSH, oestradiol, progesterone, and AMH where relevant) should be timed carefully. FSH and oestradiol are drawn on day 3 of your cycle. Progesterone is drawn approximately 7 days after ovulation. AMH can be drawn any day. If your cycle is irregular or has stopped, draw any day and interpret with your practitioner alongside your symptoms. I also have a checklist with preparation for all tests so you can get accurate results.
What if my results come back normal but I still feel terrible? This is the most common situation I see in my practice. Normal does not mean optimal, and standard reference ranges are not health targets. If your results are within range but you are still symptomatic, compare them to the optimal ranges listed in this article and consider working with a practitioner who uses functional medicine principles to interpret them in context.
Do I need to be in Maleny to work with you? No. I work with women across Australia via online consultations. If you would like support interpreting your results or putting together a personalised plan, you can book a discovery call HERE
Carolyn Allen is a naturopath and yoga therapist specialising in women's hormonal health in perimenopause and beyond. She works with women across Australia via online consultations from her practice in Maleny, Queensland. To enquire about hormone testing, results interpretation, and personalised support, visit carolynallenhealth.com or email hello@carolynallenhealth.com