Your blood is one of the most powerful windows into your health. Almost every process happening inside your body leaves a trace in your bloodstream — from how well your liver is functioning to whether your thyroid is working as it should. A blood test lets you see those traces clearly, in numbers, before symptoms ever appear.
At Nuvivo Health, we believe that knowledge is the foundation of better health. Here's a comprehensive guide to what a blood test can actually tell you.
What Is a Biomarker?
A biomarker is a measurable molecule in your blood that indicates whether normal or abnormal processes are occurring in your body. Think of biomarkers as your body's internal reporting system — constantly updating, constantly reflecting the choices you make, the conditions you have, and the direction your health is heading.
Blood tests measure dozens of biomarkers at once, giving you a detailed snapshot of your health at a given moment. Over time, tracking those biomarkers helps you spot trends, catch risks early, and make informed decisions about your lifestyle and healthcare.
What Does a Routine Blood Test Include?
A routine blood test typically covers two major profiles: a haematology profile and a biochemistry profile.
Haematology Profile (Full Blood Count) A full blood count (FBC) examines the different types of cells in your blood — your red cells, white cells, and platelets. It is one of the most commonly ordered tests and can detect a wide range of conditions including anaemia, infection, and inflammation.
Biochemistry Profile A biochemistry profile measures substances carried in your blood — such as hormones, proteins, electrolytes, and organ enzymes. Together with the FBC, it gives clinicians a broad picture of how your vital organs are performing.
What Can a Blood Test Actually Measure?
1. Red Blood Cells and Anaemia
Examining the size, shape, and number of your red blood cells can reveal whether you have anaemia — a condition where your blood isn't carrying enough oxygen to your tissues. Anaemia is commonly caused by deficiencies in iron, vitamin B12, or folate, and often explains persistent fatigue, breathlessness, and low energy.
2. White Blood Cells and Immune Health
Your white blood cells are your body's frontline defence against infection and illness. A raised white blood cell count usually means your immune system is responding to an infection. A low count can leave you more vulnerable to illness. In some cases, abnormal white blood cell patterns can indicate autoimmune conditions or, rarely, blood cancers such as leukaemia.
3. Liver Function
Your liver performs over 500 functions — from filtering toxins and metabolising drugs to producing proteins and regulating cholesterol. A liver function test measures enzymes and proteins in the blood that reveal whether the liver is under stress or damaged. Liver disease is often completely silent in its early stages, which makes blood testing one of the only reliable ways to catch it before it progresses.
4. Kidney Function
Your kidneys filter waste products and excess fluid from your blood continuously. A kidney function panel assesses how effectively they're doing this — measuring markers such as creatinine, urea, and electrolytes. Kidney health is particularly important to monitor if you have diabetes, high blood pressure, or take long-term medications.
5. Cholesterol and Heart Health
A lipid panel measures your levels of total cholesterol, HDL (good) cholesterol, LDL (bad) cholesterol, and triglycerides. These results help assess your risk of cardiovascular disease — the leading cause of death in the UK. Importantly, you can have perfectly normal total cholesterol and still carry elevated cardiovascular risk if your HDL is low or your triglycerides are high. A full lipid panel gives the complete picture.
6. Blood Sugar and Diabetes Risk
Fasting glucose and HbA1c tests reveal how your body manages sugar. HbA1c reflects your average blood sugar over the previous two to three months, making it a far more reliable indicator of diabetes risk than a single glucose reading. Catching elevated blood sugar early — before a formal diabetes diagnosis — gives you the best chance of reversing the trend through diet and lifestyle changes.
7. Thyroid Function
Your thyroid gland regulates your metabolism, energy, mood, and body temperature. An underactive thyroid (hypothyroidism) can cause fatigue, weight gain, and low mood. An overactive thyroid (hyperthyroidism) can lead to anxiety, weight loss, and heart palpitations. A thyroid function test measures TSH (thyroid-stimulating hormone), and often T3 and T4, to assess whether your thyroid is working as it should.
8. Hormones
Blood tests can measure a wide range of hormones including testosterone, oestrogen, progesterone, cortisol, DHEA, and LH/FSH. Hormone imbalances can drive symptoms ranging from low energy and poor sleep to fertility difficulties, mood changes, and reduced muscle mass. At Nuvivo Health, we offer targeted hormone panels for both men and women, with clinical interpretation included.
9. Vitamins and Minerals
Deficiencies in key nutrients are extremely common — and frequently go undetected for years. Blood tests can measure levels of:
- Vitamin D — essential for bone health, immune function, and mood
- Vitamin B12 — critical for nerve function and red blood cell production
- Iron and ferritin — the body's iron stores, often depleted before anaemia develops
- Folate — important for cell repair and particularly critical in pregnancy
- Magnesium and zinc — involved in hundreds of enzymatic processes
Identifying and correcting deficiencies through diet or supplementation can make a significant difference to how you feel day to day.
10. Inflammation
C-reactive protein (CRP) is a marker of inflammation in the body. Elevated CRP can indicate an active infection, autoimmune flare, or chronic low-grade inflammation — the kind increasingly linked to heart disease, diabetes, and cognitive decline. High-sensitivity CRP (hs-CRP) is used to assess cardiovascular risk specifically and is included in many of our wellness panels.
11. Protein Levels
Albumin and globulin are the two main proteins measured in the blood. Together they reflect liver function, kidney health, and nutritional status. Low albumin in particular can be an indicator of chronic illness or malnutrition.
Do I Have to Be Unwell to Have a Blood Test?
Absolutely not. In fact, some of the most valuable testing is done when you feel perfectly well.
Blood testing in good health serves three key purposes:
1. Early detection Many serious conditions — including liver disease, diabetes, thyroid disorders, and certain nutritional deficiencies — produce no symptoms in their early stages. Blood testing can identify changes before they cause problems, giving you time to act.
2. Establishing a baseline Your first blood test creates a reference point unique to you. Future results are then interpreted in the context of your personal trend, not just population averages. This is how you detect meaningful changes early.
3. Health optimisation You don't need a diagnosis to benefit from knowing your numbers. Understanding your hormone levels, nutritional status, and metabolic markers helps you make more targeted decisions about your diet, exercise, sleep, and supplementation.
How Often Should I Have a Blood Test?
For most healthy adults, an annual blood test is a sensible starting point. However, you may benefit from more frequent testing if you:
- Are monitoring a known condition (e.g. thyroid disease, diabetes, high cholesterol)
- Have started a new medication that affects the liver or kidneys
- Are undergoing significant dietary or lifestyle changes and want to track progress
- Have a family history of cardiovascular disease, diabetes, or hormonal conditions
- Are experiencing unexplained symptoms such as fatigue, weight changes, or mood shifts
At Nuvivo Health, your results dashboard stores all of your historical data in one place, making it easy to track changes over time and share results with your GP or specialist.
How Nuvivo Health Can Help
Nuvivo Health offers a comprehensive range of private blood tests — from targeted single-biomarker checks to advanced wellness panels covering 90+ biomarkers. Every test is:
- Processed by a UKAS-accredited laboratory
- Reviewed by a qualified clinician before results are released
- Presented in a clear, plain-English dashboard with reference ranges and explanations
- Accompanied by next-step guidance if anything requires follow-up
Whether you want to investigate symptoms, check in on your health, or simply understand your body better — we make it straightforward, reliable, and genuinely informative.
References
- Lab Tests Online UK. What is a Biomarker? labtestsonline.org.uk
- NHS. Full Blood Count (FBC). nhs.uk
- NHS. Kidney Function Tests. nhs.uk
- Pettersson J et al. Muscular exercise can cause highly pathological liver function tests in healthy men. British Journal of Clinical Pharmacology, 2008.
- British Heart Foundation. Cholesterol. bhf.org.uk
- Diabetes UK. HbA1c Test. diabetes.org.uk
Disclaimer: Results are for informational purposes only and do not constitute a clinical diagnosis. If you have health concerns, please consult your GP or a qualified healthcare professional.