Tiredness
Investigate some common causes of fatigue: CBC, thyroid, iron, vitamins, glucose, and HbA1c.
Add to your order
No referral needed
Added to your order
Click the button to view your cart
Included Markers
9 markersA multi-system panel designed to explore some of the more common causes of persistent tiredness. It covers blood count, thyroid function, iron stores, vitamins, and blood sugar markers.
Why this test?
Persistent fatigue can have many possible causes, and often multiple factors may contribute at the same time. This panel measures markers across several systems that are commonly associated with tiredness, including thyroid function, iron stores, vitamin levels, and blood sugar regulation. Rather than testing one area in isolation, this approach may help identify which systems warrant further attention.
Who is this test for?
This test may be relevant for women who:
- Experience persistent fatigue that is not explained by sleep or lifestyle factors alone
- Want to explore multiple potential causes of tiredness in one test
- Have noticed a decline in energy levels over time
- Would like data to discuss with their healthcare provider
What is tested?
This panel measures markers across multiple systems:
- Complete Blood Count (CBC): evaluates red and white blood cells and platelets
- Thyroid: TSH, Free T3, Free T4
- Iron: Ferritin
- Vitamins: Vitamin B12, Vitamin D (25-OH)
- Blood sugar: Glucose (Fasting), HbA1c
What can this test tell you?
Fatigue may be associated with low iron stores (ferritin), thyroid imbalance, vitamin deficiencies (B12 or D), blood sugar fluctuations, or changes in the blood count. By testing across these areas simultaneously, this panel may help narrow down which factors could be contributing. It is worth noting that fatigue can also have causes that are not captured by blood testing, and results should be discussed with a healthcare provider.
How is the sample collected?
The test requires a blood draw at a certified sample point (afnamepunt). There are over 750 locations across the Netherlands. Since fasting is required, scheduling a morning appointment is recommended.
When is this test useful?
This test may be considered when:
- You feel persistently tired despite adequate rest
- You want to check multiple systems that may be contributing to fatigue
- You have not had recent blood work and want a broad fatigue-focused panel
- You want data to bring to a healthcare provider appointment
What do the results mean?
Each marker is shown with your value and the reference range. Low ferritin, abnormal thyroid values, low vitamin levels, or blood sugar irregularities may each contribute to fatigue. Sometimes multiple factors are present at once. Results should be interpreted by a healthcare provider who can consider them alongside your full clinical picture.
Preparation
Fasting is required for 8 to 12 hours before the blood draw (water is permitted). Schedule a morning appointment for the most accurate glucose results.
What happens after the results?
Your results are typically available within a few working days. Each marker is presented with your value, the reference range, and an explanation. These results can serve as a starting point for a conversation with your healthcare provider about possible next steps.
Frequently Asked Questions
From order to report in 4 steps
A hormone test without referral: test when you want, not only when symptoms are severe. No waiting list, just order and go.
Choose your hormone test
Browse our hormone panels and pick what you want tested. Compare markers and prices, or build a custom test.
Receive your lab referral
Within 2-3 hours you'll receive an email from ZorgDomein with a barcode. Orders outside business hours are processed the next business day.
Get tested at a lab near you
Show the barcode on your phone and bring a valid ID. Done in under 15 minutes.
Receive your report from the doctor
A BIG-registered physician reviews your hormone values and writes a personal report. On your dashboard within a few business days.
Choose your hormone test
Browse our hormone panels and pick what you want tested. Compare markers and prices, or build a custom test.
Receive your lab referral
Within 2-3 hours you'll receive an email from ZorgDomein with a barcode. Orders outside business hours are processed the next business day.
Get tested at a lab near you
Show the barcode on your phone and bring a valid ID. Done in under 15 minutes.
Receive your report from the doctor
A BIG-registered physician reviews your hormone values and writes a personal report. On your dashboard within a few business days.
Always a location near you
With more than 450+ certified phlebotomy points across the Netherlands.
What We Test
This test includes 9 biomarkers to give you a comprehensive health picture.
HbA1c (glycated haemoglobin) reflects your average blood sugar levels over the past 2-3 months. It is the gold standard for long-term blood sugar monitoring and diabetes management.
Learn moreTSH, or thyroid-stimulating hormone, is produced by the pituitary gland and controls the thyroid. It is the most commonly used blood value to assess thyroid function. An abnormal TSH level can indicate an underactive thyroid (hypothyroidism) or an overactive thyroid (hyperthyroidism). Thyroid problems are common — especially in women — and can cause a wide range of symptoms, from fatigue and weight gain to palpitations and nervousness.
Learn moreGlucose is the primary energy source for your body. Your fasting glucose level (measured after at least eight hours of fasting) indicates how well your body can regulate blood sugar. An elevated fasting glucose can indicate prediabetes or type 2 diabetes, while a low value (hypoglycaemia) can cause symptoms such as trembling, sweating, and difficulty concentrating.
Learn moreFree T4 (thyroxine) is the main hormone produced by the thyroid gland. It may serve as a precursor that your body converts into the more active T3. Healthcare providers often consider Free T4 a primary indicator of thyroid gland output.
Learn moreVitamin B12 is considered essential for red blood cell formation, neurological function, and DNA synthesis. Deficiency may develop gradually and is sometimes associated with dietary patterns. Healthcare providers can help interpret your results.
Learn moreVitamin D is a fat-soluble vitamin that plays a key role in calcium absorption, bone health, and immune function. It is primarily produced in the skin through sunlight exposure and can also be obtained from certain foods and supplements.
Learn moreFree T3 (triiodothronine) is considered the most active thyroid hormone. It may play a key role in regulating metabolism, energy production, and body temperature. Healthcare providers often assess Free T3 alongside other thyroid markers for a comprehensive picture.
Learn moreFerritin is the primary storage protein for iron in your body. It reflects your iron stores more accurately than iron levels themselves, which can fluctuate considerably throughout the day. Low ferritin is the earliest sign of iron deficiency — often measurable before your haemoglobin drops and anaemia develops. High ferritin can indicate iron overload but is also a widely used inflammation marker. Interpretation always depends on the clinical context.
Learn moreA complete blood count (CBC) is a comprehensive blood test that evaluates the major components of your blood: red blood cells, white blood cells, and platelets. It is one of the most commonly ordered blood tests and provides a broad overview of your overall health.
Learn moreHbA1c (Glycated Hemoglobin)
MetabolicHbA1c (glycated haemoglobin) reflects your average blood sugar levels over the past 2-3 months. It is the gold standard for long-term blood sugar monitoring and diabetes management.
HbA1c provides a long-term view of blood sugar control, unlike fasting glucose which reflects a single point in time. It is essential for diabetes diagnosis and management. Consult your healthcare provider.
TSH (Thyroid Stimulating Hormone)
ThyroidTSH, or thyroid-stimulating hormone, is produced by the pituitary gland and controls the thyroid. It is the most commonly used blood value to assess thyroid function. An abnormal TSH level can indicate an underactive thyroid (hypothyroidism) or an overactive thyroid (hyperthyroidism). Thyroid problems are common — especially in women — and can cause a wide range of symptoms, from fatigue and weight gain to palpitations and nervousness.
TSH is often used as a first test to see how the thyroid is functioning. A value within the normal range is generally considered reassuring, while a high-normal or unusual value may be a reason to look further. An underactive thyroid, for example, can go together with a higher TSH. Your GP can place your TSH result in context and decide with you whether further testing is needed. In some cases the GP refers to an internist-endocrinologist. Sometimes it is enough to check less often.
Glucose (Fasting)
MetabolicGlucose is the primary energy source for your body. Your fasting glucose level (measured after at least eight hours of fasting) indicates how well your body can regulate blood sugar. An elevated fasting glucose can indicate prediabetes or type 2 diabetes, while a low value (hypoglycaemia) can cause symptoms such as trembling, sweating, and difficulty concentrating.
Type 2 diabetes affects more than one million people in the Netherlands, and an estimated 1.1 million more have prediabetes without knowing it. Untreated, diabetes significantly increases the risk of cardiovascular disease, kidney damage, eye problems, and nerve damage. Prediabetes is a reversible stage. With lifestyle adjustments — weight loss, more exercise, less sugar and processed carbohydrates — more than half of people with prediabetes can prevent developing diabetes. This makes early detection through a fasting glucose test or HbA1c very valuable.
Free T4 (Thyroxine)
ThyroidFree T4 (thyroxine) is the main hormone produced by the thyroid gland. It may serve as a precursor that your body converts into the more active T3. Healthcare providers often consider Free T4 a primary indicator of thyroid gland output.
Free T4 may help your healthcare provider determine whether your thyroid gland is producing adequate hormone levels. Some experts consider it one of the most informative markers for detecting both overactive and underactive thyroid conditions early.
Vitamin B12
VitaminsVitamin B12 is considered essential for red blood cell formation, neurological function, and DNA synthesis. Deficiency may develop gradually and is sometimes associated with dietary patterns. Healthcare providers can help interpret your results.
Vitamin B12 is believed to be vital for healthy nerve cells, red blood cell formation, and DNA synthesis. A vitamin B12 deficiency can develop slowly and is sometimes associated with anaemia, fatigue, and tingling in your hands and feet. Having a blood test done can help bring a vitamin shortage into view, so you can discuss it with your GP.
Vitamin D (25-OH)
VitaminsVitamin D is a fat-soluble vitamin that plays a key role in calcium absorption, bone health, and immune function. It is primarily produced in the skin through sunlight exposure and can also be obtained from certain foods and supplements.
Adequate vitamin D levels are essential for strong bones, a well-functioning immune system, and overall well-being. Low levels may be associated with an increased risk of bone disorders, mood changes, and weakened immunity. Consult your healthcare provider for personalised advice.
Free T3 (Triiodothyronine)
ThyroidFree T3 (triiodothronine) is considered the most active thyroid hormone. It may play a key role in regulating metabolism, energy production, and body temperature. Healthcare providers often assess Free T3 alongside other thyroid markers for a comprehensive picture.
Free T3 may help your healthcare provider evaluate how well your thyroid is functioning at a cellular level. Some experts suggest it can reveal conversion issues that other thyroid tests might miss, potentially offering a more complete understanding of thyroid health.
Ferritin
MineralsFerritin is the primary storage protein for iron in your body. It reflects your iron stores more accurately than iron levels themselves, which can fluctuate considerably throughout the day. Low ferritin is the earliest sign of iron deficiency — often measurable before your haemoglobin drops and anaemia develops. High ferritin can indicate iron overload but is also a widely used inflammation marker. Interpretation always depends on the clinical context.
Iron is important for oxygen transport, energy and your immune system. A ferritin test can help bring iron deficiency into view before anaemia develops, or iron overload that may strain organs over time. Reference values differ per laboratory and per person; in adults they often lie somewhere between 25 and 250 micrograms per litre, and for some groups between 20 and 100. If values are abnormal, your GP may suggest further investigations. The value is usually not viewed on its own. Your GP often also looks at <a href="/en/biomarkers/iron-serum">iron</a>, <a href="/en/biomarkers/hemoglobin">haemoglobin</a> and <a href="/en/biomarkers/transferrin">transferrin</a> to get a fuller picture. Consult your GP for personalised advice.
Complete Blood Count (CBC)
HematologyA complete blood count (CBC) is a comprehensive blood test that evaluates the major components of your blood: red blood cells, white blood cells, and platelets. It is one of the most commonly ordered blood tests and provides a broad overview of your overall health.
The CBC is a cornerstone of preventive healthcare and diagnostic medicine. It can help detect a wide range of conditions including anemia, infections, immune disorders, blood cancers, and clotting problems. Regular CBC testing supports early detection and ongoing health monitoring.
You Might Also Like
Explore more tests for your hormonal health journey.
Extended Health Checkup
Our broadest panel: CBC, thyroid, vitamins, lipids, liver, kidney, and HbA1c.
Basic Health Checkup
Key health markers: CBC, lipids, and Vitamin D.
Complete Metabolic Panel
Comprehensive metabolic panel: electrolytes, kidney, liver, glucose, HbA1c, and protein.
This test not quite right?
Build your own blood test from 180+ individual biomarkers — choose exactly what you need.
Have a question?
Our team is happy to help. Ask your question and we'll respond as soon as possible.