What Blood Tests Should You Get? A Science-Based Guide | YEARS

The last lab report from your doctor likely included your cholesterol and blood sugar levels. A solid baseline. But these values only cover a small fraction of what your blood can reveal about your health. Crucial risk signals, such as those for heart disease or silent inflammation, simply don't appear in a standard check-up.

Many people don't know what blood tests they should really get regularly. Insurance providers, wellness blogs, and primary care physicians sometimes offer conflicting advice. This article brings clarity to the topic based on current medical research: which tests are useful for whom, what's the difference between a standard blood panel and in-depth preventive diagnostics, and when are tests simply unnecessary?

The Basics: What a Blood Test Actually Reveals

Blood is a complex transport system that provides detailed insights into virtually every organ system. A blood test separates and analyzes its components.

What is a blood panel?

Blood consists of about 55% liquid plasma, which contains dissolved nutrients, proteins, hormones, fats, and salts. The remaining 45% are cellular components: red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes).

A complete blood count (CBC) analyzes only the cellular components, providing information about anemia, infections, or clotting disorders. A CBC with differential adds a detailed breakdown of the different types of white blood cells. Clinical chemistry measures the substances dissolved in the plasma: liver enzymes, kidney function markers, blood lipids, and glucose. These are the biomarkers relevant for prevention.

When we talk about "important blood tests," we usually mean a combination of a CBC with differential and selected clinical chemistry parameters.

Who needs which tests?

The optimal testing strategy depends on age, sex, lifestyle, family history, and existing symptoms. A 28-year-old female endurance runner on a vegan diet needs a different profile than a 54-year-old male smoker with a family history of hypertension. Prevention means targeted risk assessment, not an indiscriminate data dump.

Standard Blood Tests: What a Basic Check-Up Covers

In many healthcare systems, routine check-ups for adults are designed to screen for the most common lifestyle-related diseases. The blood tests included are limited but form an absolute baseline.

These 5 parameters are typically included

1. Total Cholesterol: A rough indicator of the lipid profile.
2. LDL and HDL Cholesterol: The classic distinction for a basic risk assessment of cardiovascular disease.
3. Triglycerides: Blood fats that are often elevated due to excess weight, alcohol consumption, and a high-carbohydrate diet.
4. Fasting Glucose: A simple test for the early detection of potential diabetes.
5. Urinalysis: A test strip checks for protein, sugar, and blood, which can indicate kidney or urinary tract diseases.

What's missing in a standard check-up

A basic check-up is better than no screening at all. However, from the perspective of modern preventive medicine, it leaves significant gaps. Markers for chronic inflammation, specific cardiac risks, vitamin and mineral status, or thyroid function are completely absent. The result is a very rough picture. Subtle signals that indicate risks years before a disease manifests remain invisible.

Modern Biomarkers: What Research Recommends for Prevention

Over the past decade, medical research has identified biomarkers that predict risks far more accurately than standard parameters. Anyone who wants to proactively manage their health should be familiar with them.

ApoB: The more precise cardiac marker

A standard check-up measures LDL cholesterol, which is the amount of cholesterol within fat particles. Leading cardiologists increasingly recommend Apolipoprotein B (ApoB) because it reflects the number of atherogenic particles themselves. Each of these particles carries exactly one ApoB molecule, making ApoB a more direct measure of the particle burden in the blood. The INTERHEART study, with over 26,000 participants, showed that the ApoB/ApoA1 ratio is the strongest lipid risk parameter for heart attacks (Yusuf et al., The Lancet 2004). That's why ApoB is a central standard marker in the YEARS Core® program.

Lp(a): The genetic risk factor

Lipoprotein(a), or Lp(a), is 70–90% genetically determined and hardly influenced by lifestyle. About 20% of the population has elevated levels, which significantly increases their risk of heart attack and stroke, often independent of cholesterol or other classic risk factors (Tsimikas et al., European Heart Journal 2022). Lp(a) is never measured in a standard check-up. A single measurement in a lifetime is sufficient to know this baseline genetic risk.

hs-CRP: Detecting chronic inflammation

High-sensitivity C-reactive protein (hs-CRP) indicates chronic, low-grade inflammatory processes. This "silent inflammation" drives the development of atherosclerosis. An analysis of the UK Biobank with over 300,000 women confirmed that high hs-CRP significantly increases cardiovascular risk even with normal cholesterol levels (Ridker et al., NEJM 2008). The YEARS Core® program measures hs-CRP as a standard.

Homocysteine: An overrated marker

Homocysteine was long considered an important risk factor for heart disease. However, large intervention studies have shown that medically lowering its levels with B vitamins does not reduce the risk of heart attack (The Heart Outcomes Prevention Evaluation 2 Investigators, NEJM 2006). Extremely high levels can indicate rare genetic defects. As a routine prevention marker, it is now controversial among experts.

NT-proBNP: An indicator of cardiac stress

NT-proBNP is a peptide released by the heart under increased stress or stretching. In a clinical setting, it is used to diagnose and monitor heart failure. As a pure screening marker in asymptomatic individuals, it has limitations (Ledwidge et al., JAMA 2013). However, as part of a comprehensive diagnostic assessment like the one performed in the YEARS Core® program, it provides valuable additional information about cardiac status.

What Blood Tests to Get for Your Lifestyle

Beyond the markers mentioned above, there are specific values that are particularly relevant depending on your life situation.

For athletes and fitness-focused individuals

Those who regularly challenge their bodies should keep an eye on specific parameters.

• Creatine Kinase (CK): Released during muscle exertion. Chronically elevated levels can indicate overtraining.
• Ferritin: The body's iron store. A deficiency leads to a drop in performance and fatigue, which is common, especially among female endurance athletes.
• Magnesium: Important for muscle function. A deficiency can contribute to cramps and exhaustion.
• Vitamin D: Essential for bone health and immune function.

For people with high stress levels

Chronic stress leaves measurable traces in the hormonal system.

• Cortisol: The primary stress hormone. A daily profile from saliva or a 24-hour urine collection is more informative than a single blood measurement at a random time.
• DHEA-S: A counterpart to cortisol. The ratio of these two hormones provides insight into the adrenal gland's resilience to stress.

These hormone analyses are part of the advanced diagnostics in the YEARS Evolve® program.

For vegans and vegetarians

A plant-based diet requires attention to certain micronutrients.

• Vitamin B12: Found almost exclusively in animal products. Holo-transcobalamin (Holo-TC) or methylmalonic acid (MMA) in the blood are more reliable indicators, as standard B12 levels can often be falsely normal.
• Ferritin: Plant-based iron is absorbed less efficiently. The storage value is therefore particularly relevant.
• Vitamin D: Relevant for anyone with limited sun exposure.
• Zinc, Selenium, and Iodine: Can be deficient in a non-diversified diet.

For people aged 65 and over

Physiological needs and risk profiles change with age.

• Bone Metabolism: Vitamin D, calcium, and alkaline phosphatase provide clues about osteoporosis risk.
• Kidney Function: Cystatin C is more precise than standard creatinine because it is less dependent on muscle mass, providing more realistic values in older age.
• Thyroid: Hypothyroidism is common in older adults and can manifest as fatigue, weight gain, or depressive moods. TSH, fT3, and fT4 are crucial here.

Beyond Biomarkers: What Biological Clocks Reveal

The most advanced form of prevention asks how old your body truly is at a cellular level, regardless of your chronological age.

What is epigenetic age?

Epigenetics describes how environmental and lifestyle factors turn genes on and off. These patterns, known as DNA methylation, change over a lifetime and can be analyzed with special algorithms. The result is an estimate of biological age. Studies show that this epigenetic age is a better predictor of overall health and life expectancy than chronological age.

This analysis is not a routine test. At YEARS, it is part of the Evolve® and Ultimate® programs and creates a highly personalized basis for lifestyle interventions.

A Critical Look: When Are Tests Not Useful?

More data is not automatically more helpful. A central principle in medicine is: only test if the result has a consequence.

The screening dilemma

Not every screening measurably extends life expectancy. A frequently cited study estimates the gain from mammography at zero days and from PSA screening for prostate cancer at a questionable 37 days (Welch et al., JAMA Internal Medicine 2016). The problem is false-positive results, which create anxiety and trigger unnecessary follow-up procedures. A sensible prevention strategy focuses on evidence-based tests with clear benefits.

Vitamin tests: Useful or a waste of money?

Routine vitamin panels without a specific suspicion are rarely useful in a country like Germany with no widespread malnutrition. A vitamin D test is indicated for at-risk groups or those with symptoms, and a B12 test for vegans or older adults with neurological issues. A physician's assessment determines which tests are actually needed.

How Often Should You Get Blood Tests?

The frequency should be based on age and individual risk.

More important than rigid intervals is establishing a personal baseline. Only by knowing your individual starting values can you detect deviations over time early on.

The Art of Interpretation: Normal vs. Optimal

A lab report is not a verdict but a dataset that requires medical interpretation.

The normal range is a statistical corridor that contains the values of 95% of a healthy reference group. Conversely, this means that 5% of healthy people fall outside this range without being ill.

The optimal range is narrower. It describes the range associated with the lowest risk of disease according to current studies.

The most revealing information comes from the individual trend. A fasting blood sugar that rises from 85 to 98 mg/dl over five years can be an early warning sign of developing insulin resistance, even though both values are technically within the normal range. This shift is only noticeable if you test regularly and compare the results.

Beyond Standard: What Comprehensive Diagnostics Can Achieve

A meaningful prevention strategy integrates blood tests into a complete picture that includes imaging, functional diagnostics, and genetics. The YEARS portfolio reflects this approach:

• YEARS Core®: In addition to the 87 most important biomarkers (including ApoB, hs-CRP, HOMA index, NT-proBNP), the program includes advanced ultrasound (heart, abdominal organs, thyroid, blood vessels), body plethysmography for lung function, AI skin screening, a VO₂max performance test, and neurocognitive tests, all in one day.
• YEARS Evolve®: Complements Core® with a whole-body MRI, a liquid biopsy for cancer screening, measurement of 7 epigenetic clocks (biological age), and an expanded hormone panel including testosterone, DHEA-S, and cortisol.
• YEARS Ultimate®: Additionally includes complete genetic analysis (Whole-Exome and Whole-Genome Sequencing) and a gut microbiome analysis.

The goal is not to accumulate data, but to create a multidimensional baseline that serves as the starting point for a medically guided prevention plan.

FAQ: Your Most Common Questions Answered

1. Do I need to fast for a blood test? For blood sugar, cholesterol, and triglycerides, a fasting period of 8 to 12 hours is necessary. Only water is permitted. Without fasting, the results will be skewed by your last meal and will not be comparable.

2. Can I test important blood markers at home? At-home tests are increasingly available, usually using a drop of blood from the fingertip. For individual markers like vitamin D, they can provide an initial orientation. However, sample collection is prone to errors, and the validity of the results is not always comparable to a venous blood draw in a lab. Without medical interpretation, the value of the results is limited.

3. What does a private blood test cost? Individual markers can cost between 10 and 40 euros. Comprehensive panels with modern biomarkers can quickly add up to several hundred euros. YEARS Core® (€1,900) bundles these costs into a package that includes imaging, functional diagnostics, and medical consultation in addition to blood analysis.

4. Does private health insurance cover advanced blood tests? Reimbursement depends on the individual plan. Standard check-ups are usually covered. Advanced markers like ApoB or Lp(a), genetics, or whole-body MRIs are plan-dependent. Since YEARS diagnostics often identify medical indications, partial reimbursement by private insurance based on the official medical fee schedule (GOÄ) is possible in many cases.

Which Combination Is Right for You?

For a healthy 35-year-old with no family history, a standard check-up supplemented with a one-time measurement of ApoB and Lp(a) is a good start. Those with a family history of disease, who exercise regularly, or follow a strictly plant-based diet need a more extensive profile. From age 50 onwards, thyroid, kidney function, and inflammation markers should be part of the basic diagnostics. For those who want to know how much lifestyle and environment have influenced their biological aging, epigenetic analysis is essential.

Blood tests become useful tools when an experienced physician places them in the context of your overall health and derives concrete, actionable recommendations. Without this interpretation, they are just numbers on a page.

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Sources

• Ledwidge, M. T., Gallagher, J., Kelly, C., et al. (2013). Natriuretic peptide-based screening and collaborative care for heart failure: the STOP-HF randomized trial. JAMA, 310(1), 66–74.
• Ridker, P. M., Danielson, E., Fonseca, F. A. H., et al. (2008). Rosuvastatin to prevent vascular events in men and women with elevated C-reactive protein. New England Journal of Medicine, 359(21), 2195–2207.
• The Heart Outcomes Prevention Evaluation (HOPE) 2 Investigators. (2006). Homocysteine lowering with folic acid and B vitamins in vascular disease. New England Journal of Medicine, 354(15), 1567–1577.
• Tsimikas, S., & Fazio, S. (2022). Lipoprotein(a): An important and common genetic risk factor for cardiovascular disease. European Heart Journal, 43(39), 3968–3982.
• Welch, H. G., & Black, W. C. (2016). Overdiagnosis in Cancer. JAMA Internal Medicine, 176(4), 548.
• Yusuf, S., Hawken, S., Ounpuu, S., Dans, T., Avezum, A., Lanas, F., McQueen, M., Budaj, A., Pais, P., Varigos, J., & Lisheng, L. (2004). Effect of potentially modifiable risk factors associated with myocardial infarction in 52 countries (the INTERHEART study): case-control study. The Lancet, 364(9438), 937–952.