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The most common blood tests

June 15, 2025

Are you unsure which blood test you need? Many people experience symptoms without knowing the cause – blood tests can provide clarity and peace of mind.

At Doctors in Denmark, we offer a wide range of blood tests that help uncover everything from infection and fatigue to allergies and heart health. Here you get an overview of the most common blood tests and what they can tell you about your body.

Blood sample testing

Infection and inflammation blood test

Blood tests for infections and inflammations measure, among other things, CRP (C-reactive protein), white blood cell count and erythrocyte sedimentation rate (ESR). They are used to assess whether the body is fighting an infection - and how strong the reaction is.

When is it relevant?

If you have a fever, fatigue, swelling, or pain, it may be a sign of an infection or an inflammatory condition. The test helps to assess whether antibiotics or further investigation are needed.

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Sexually transmitted blood tests

There are blood tests that can detect infectious diseases such as HIV, hepatitis B and C, and syphilis. These tests are recommended both if you have symptoms and as part of routine check-ups.

Safety and discretion

With us, the test is performed discreetly and professionally. Many people choose to have this test done as part of their health check or after having a new sexual partner.

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Allergy blood test

If you often have itching, hives, or difficulty breathing, an allergy blood test can help identify what you are intolerant to.

The test measures the level of immunoglobulin E (IgE), which the body produces in response to allergens. It can be used for both food allergies and pollen, pet dander, and dust allergies.

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Anemia blood test

Fatigue, dizziness and paleness can be signs of anemia. A blood test can reveal if you are deficient in iron, vitamin B12 or folic acid - and what the cause of the anemia is.

By measuring hemoglobin, ferritin and other blood parameters, we get an accurate picture of your blood status.

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Metabolism blood test

An overactive or underactive metabolism can affect your energy, weight and mental state. Metabolic blood tests measure TSH and T4 in particular to assess the function of the thyroid gland.

Typical symptoms

Fatigue, feeling cold, weight changes and difficulty concentrating are common symptoms. A simple blood test can determine if your metabolism is balanced.

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Heart blood test

Blood tests for the heart are used to measure cholesterol levels, triglycerides and any heart-specific markers such as troponin. They provide insight into the risk of blood clots and atherosclerosis.

This is an important part of a preventive effort – especially if you have a family history or lifestyle factors such as smoking or high blood pressure.

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Obesity blood test

Obesity can affect many systems in the body. A blood test can reveal imbalances in metabolism, hormones, cholesterol levels, and blood sugar.

Understand your body's signals

By taking this type of blood test, you gain valuable knowledge that can be used to adjust diet, exercise and possibly medical treatment.

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Fatigue blood test

Do you constantly feel tired without knowing why? There can be many explanations - from vitamin deficiency to low metabolism or chronic infection.

A fatigue blood test covers a broad spectrum and helps to identify the cause, so you can get the right treatment and get your energy back.

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Large health blood test

The comprehensive health blood test is an extensive panel that provides a broad picture of your health status. It includes measurements of kidney and liver function, fluid and salt balance, cholesterol levels, long-term blood sugar, blood cells, metabolism, infection levels, and vitamin D, among other things.

When the symptoms are unclear

This blood test is particularly useful if you have vague symptoms that do not clearly point to one area. It is often used to identify hidden imbalances or to get a holistic picture of your body – so we can intervene in the right place.

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Lead blood test

Lead poisoning is rare but can be serious. A lead blood test is relevant if you have been exposed to old building materials, contaminated soil, or work in specific industries.

Symptoms can be vague – such as headache, fatigue or stomach problems – and the test can quickly provide clarity.

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