Why Am I Always Tired? The Blood Test Every Australian Woman Should Run
Constant exhaustion is not normal, and it is not "just life". For most women, the answer is hiding in six blood markers your GP rarely checks together. Here is what to test and what your results actually mean.
Most cases of female fatigue trace back to one of six blood markers.
Low ferritin or iron, an underactive thyroid, low vitamin B12, low vitamin D, or chronically high cortisol. A single comprehensive blood test can check all six together, often in one visit. With MediTests, you can order it privately, no GP referral or appointment needed, and get results in 24 to 48 hours.
Tired Is Not the Default
If you have ever felt brushed off when telling a doctor you are exhausted, you are not alone. Fatigue is one of the most under-investigated complaints in women's health, often dismissed as stress, motherhood, perimenopause, or "just being busy".
The reality is that constant tiredness almost always has a measurable cause. Your body is signalling that something needs attention. The hard part is that standard GP blood tests usually only check one or two of the markers that explain it, and the rest get left out unless you specifically ask.
This guide walks you through the six most common blood markers behind female fatigue, what each one tells you, and which MediTests panel covers them so you can stop guessing.
The 6 Blood Markers Behind Most Female Fatigue
If you are always tired, these are the markers worth checking. Each one can be a standalone cause of exhaustion, and they often overlap.
| # | Marker | Why It Causes Fatigue | Common Signs |
|---|---|---|---|
| 1 | Ferritin Iron storage | Ferritin is the body's iron reserve. When it is low, your cells cannot transport enough oxygen, and you feel exhausted even after a full night's sleep. | Constant tiredness, brain fog, hair shedding, breathlessness on stairs, restless legs, looking pale. |
| 2 | Iron Studies Haemoglobin, transferrin, saturation | Even when haemoglobin looks normal, the rest of the iron picture can show you are heading toward deficiency, especially if you menstruate. | Heavy periods, exercise intolerance, cold hands and feet, frequent infections. |
| 3 | Thyroid Function TSH, Free T3, Free T4 | Your thyroid sets your metabolic rate. When it slows down, everything slows down: energy, digestion, mood, weight regulation, body temperature. | Weight gain that will not budge, feeling cold, dry skin, hair thinning, slow digestion, low mood. |
| 4 | Vitamin B12 Active B12 / serum B12 | B12 is essential for red blood cell production and nervous system function. Low levels mimic iron deficiency and can also cause neurological symptoms. | Pins and needles, brain fog, low mood, muscle weakness, particularly common in vegetarians and vegans. |
| 5 | Vitamin D 25-hydroxyvitamin D | Vitamin D affects energy production at the cellular level, immune function, mood and bone health. Deficiency is extremely common in Australian women, even in sunny climates. | Low energy, low mood, frequent illness, muscle aches, poor sleep quality. |
| 6 | Cortisol AM & PM stress hormone | Chronically high cortisol from ongoing stress disrupts your sleep, drives weight gain around the middle, and leaves you feeling wired but tired. | Tired in the morning, second wind at night, anxiety, sugar cravings, stubborn belly fat, poor recovery. |
Ready to get answers?
View women's panelsWhy Women Are Hit Harder by Fatigue
Female bodies face fatigue triggers that male bodies do not. Each one is normal, none of them are individually a problem, but stacked together they explain why so many women feel constantly drained.
- Monthly iron loss. Menstruation depletes iron stores every cycle. Heavy periods make this worse. Ferritin can drop long before haemoglobin does.
- Hormonal fluctuations. Oestrogen, progesterone and thyroid all interact. A small shift in one can cascade across energy, sleep and mood.
- Postpartum depletion. Pregnancy and breastfeeding draw heavily on iron, B12, vitamin D and thyroid reserves. Many women never fully replenish.
- Perimenopause. Starting in the late 30s for some women, hormone shifts can disrupt sleep, energy and mood for years before menopause itself.
- Higher cortisol load. Research consistently shows women carry more chronic stress, particularly when balancing work with caregiving roles.
None of this means feeling exhausted is the price of being a woman. It means a proper blood test, one that checks all the relevant markers in a single visit, is the fastest way to find out what is actually going on.
Recommended MediTests Panels for Fatigue
Three options depending on how deep you want to go. All three include the markers most likely to explain your tiredness.
Full Thyroid Check
If thyroid is your suspicion, this is the cleanest first step. Covers TSH, free T3, free T4 and thyroid antibodies in one panel.
- TSH
- Free T3 & Free T4
- Thyroid antibodies
- Best for: weight gain, brain fog, feeling cold
Women's Hormone & Metabolic Health Check
Built specifically to identify the underlying causes of low energy in women. Covers all six fatigue markers plus hormones and inflammation.
- Iron studies & ferritin
- Full thyroid panel
- Vitamin B12 & D
- Cortisol & female hormones
- Inflammation markers
Complete Women's Health & Wellness Check
The full picture. Hormones, organ function, nutrients, inflammation, metabolism and heart health in a single visit.
- Everything in the Hormone & Metabolic Check
- Liver & kidney function
- Cardiovascular markers
- Full nutrient panel
Prefer to pick your own markers? Build your own panel from individual biomarkers.
"My GP Said My Bloods Were Normal"
This is the most common frustration we hear. The reason your bloods can come back "normal" while you still feel exhausted is that:
- Standard GP panels often only check haemoglobin, not full iron studies or ferritin
- TSH alone misses thyroid issues that show up only on free T3 or free T4
- Cortisol, B12 and vitamin D are not always tested unless you specifically request them
- "Normal range" is a wide bracket, your number might be in range but still suboptimal for you
A comprehensive panel checks all of it together, so nothing gets missed.
How to Get Tested
Three steps from order to answers.
Order Your Panel Online
Choose the panel above that suits your situation. Check out securely. Your pathology referral arrives in your inbox within minutes.
Walk Into a Collection Centre
Take your referral and photo ID to any of our 3,300+ accredited collection centres across Australia. No appointment needed. The visit usually takes under 10 minutes.
Get Your Results in 24 to 48 Hours
Your full lab report is sent securely to your inbox. Use it to take action yourself, or take it to your GP for a more informed conversation.
Why Australian Women Choose MediTests
Built for women who want clarity without the gatekeeping.
No GP referral needed
Order any panel directly. No clinical justification required.
Designed for women specifically
Panels built around female biology, not adapted from generic checks.
NATA-accredited labs
The same labs used by GPs and specialists.
Walk-in collection
3,300+ centres Australia-wide, no booking needed.
Private & confidential
Not Medicare-linked, not on your My Health Record. Yours alone.
Fast 24 to 48 hour results
Sent securely to your inbox.
Common Questions
What is the best blood test if I am always tired?
For most women, the Women's Hormone & Metabolic Health Check is the best single test for unexplained fatigue. It covers iron, ferritin, thyroid, B12, vitamin D, cortisol and female hormones in one panel, capturing all six markers most likely to be the cause.
Can low iron cause fatigue even if my GP says my bloods are normal?
Yes. Standard GP panels often only check haemoglobin, which can stay in range while ferritin (your iron storage) is critically low. A full iron studies panel including ferritin gives a much clearer picture, especially for menstruating women.
How soon will I notice changes after correcting a deficiency?
It varies by marker. Vitamin D and B12 changes can be felt within weeks of supplementation. Ferritin takes longer, often three to six months to rebuild stores. Thyroid changes depend on the underlying cause and any treatment your GP recommends. Re-testing after eight to twelve weeks is a good way to track progress.
Do I need a GP referral for these tests?
No. MediTests is a self-request pathology service. You can order any panel directly online without a referral or consult, and your pathology referral arrives instantly in your inbox.
Should I take my results to my GP?
If anything comes back outside the recommended range, yes. MediTests results come as a full original lab report in the same format your GP is used to reading. Many women use private testing to spot the issue, then bring the results to their GP for treatment or a follow-up plan.
How much does it cost?
The Full Thyroid Check is currently $175. The Women's Hormone & Metabolic Health Check is $699. The Complete Women's Health & Wellness Check is $849. All include the referral, collection and full results, with no hidden fees.
When is the best time of day to test?
Cortisol is best collected in the morning when levels naturally peak. Iron studies are also typically done in the morning. For most other markers timing matters less. If you want a precise menstrual cycle window for hormones, day three to five of your cycle is the standard for early-cycle hormone testing.
Stop Guessing, Start Knowing
You should not have to live tired. Order your panel online, walk in to a collection centre, and get the answers in 24 to 48 hours.
View Recommended Panel Browse All Women's Tests