Order a fatigue blood test and check your energy

Tiredness is hard to read from symptoms alone, because so many systems can play a part. This fatigue blood test therefore looks more broadly: at your thyroid function, your iron status, your blood count, two vitamins and your blood sugar.

By measuring these markers together, you can spot patterns that a single test might miss. It is not a diagnosis, but a snapshot you can discuss with a doctor alongside your symptoms. For many men, a measurement like this feels like a concrete first step towards understanding where their energy has gone.

This test may suit men who:

• have been tired for a long time, even after enough sleep and rest
• notice their physical or mental performance dropping without a clear reason
• want to check whether a nutritional deficiency or metabolic factor could be involved
• prefer a targeted panel over testing individual markers one by one

A test like this can also be handy if you simply want to know where you stand.

This test measures nine biomarkers in your blood, across five areas:

• Complete blood count (CBC): your red and white blood cells, haemoglobin, haematocrit and platelets. May reveal anaemia or other factors associated with fatigue.
• Thyroid: TSH, free T3 and free T4. Your thyroid can influence your energy, your metabolism and your mood.
• Iron: ferritin, which reflects your iron stores. These may be low before your blood count shows anything.
• Vitamins: vitamin B12 and vitamin D (25-OH). Low levels of either can be associated with fatigue.
• Blood sugar: fasting glucose and HbA1c. How your blood sugar is regulated may play a part in how stable your energy is through the day.

You can read more about individual markers on the pages about ferritin and vitamin B12.

Your results may say something about which areas could be contributing to how tired you feel. Low ferritin alongside a normal blood count could, for example, point to early iron depletion, before anaemia is present.

Thyroid markers outside the expected range may suggest your thyroid is playing a part in low energy. Suboptimal vitamin D or B12 levels can also be associated with tiredness, as can swings in your blood sugar. By viewing the results as a whole, a doctor can recognise patterns that a single test would not show. It remains a snapshot, not a diagnosis.

For this test, blood is drawn at a certified sample point. There are 700+ locations across the Netherlands, which you choose yourself after ordering.

You do not need to see your GP first: this is a blood test without a referral, and you pick a location and time that suit you. The draw is done by trained staff and usually takes only a few minutes. Your blood then goes to the lab, where your values are determined.

This fatigue blood test can be useful when your tiredness persists and is not easily explained by things like sleep deprivation or hard training. When fatigue comes with difficulty concentrating, muscle weakness or mood changes, a test like this can help you check whether measurable factors are involved.

If you specifically want to know whether anaemia is at play, the more focused anaemia workup may fit better. This test deliberately looks more broadly across several systems.

Each marker appears with its reference range. Because fatigue can involve several overlapping factors, the most useful insights often come from looking at the results as a whole.

A value outside the reference range does not automatically mean something is wrong. What counts as a healthy value varies by lab, age and time of sampling. A doctor can help interpret which findings may contribute to your symptoms and whether further investigation could be worthwhile.

For a reliable fasting glucose, you need to fast for 8 to 12 hours before the draw. Drinking water is fine during the fasting period.

Book your appointment in the morning if you can. If you use medication or supplements that can affect your thyroid, iron or vitamins, ask your doctor whether they could influence your result.

Your results are available online within a few working days in your personal dashboard. You log in whenever it suits you and see each value alongside its reference range, with a clear explanation.

Every blood test result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.