Last medically reviewed: 23 March 2026

Best Longevity Blood Tests to Track Biological Age UK

Last updated: March 2026

By Dr. Alex Turner, Longevity Specialist with 15+ years in preventive medicine and anti-ageing research

If you’re like me, keen to understand not just how old you are on paper but what your body’s actually doing underneath, then you’ll appreciate the growing buzz around biological age. Unlike chronological age—which just ticks up year by year—biological age tries to measure your body’s true physiological state. And blood tests are among the most accessible, practical ways to get a snapshot of that. But with so many markers and panels out there, which are the best longevity blood tests to track biological age here in the UK? I’ve sifted through the research, NHS offerings, and private lab options to give you a clear, no-nonsense guide to what’s proven, what’s hype, and what’s worth your time and money.

Why Biological Age Matters More Than Chronological Age

We all know a 60-year-old marathon runner who feels decades younger and a 40-year-old couch potato who feels old. That’s the difference biological age tries to capture. It reflects cellular health, organ function, and metabolic efficiency—factors that chronological age can’t reveal. In my practice, I’ve seen how tracking biological age helps tailor interventions, from diet tweaks to supplements, that genuinely extend healthspan (the years lived in good health).

Biological age is influenced by genetics, lifestyle, environmental exposure, and chronic conditions. Importantly, it’s not set in stone. With the right data, you can actively lower your biological age and delay age-related diseases.

Top Blood Tests to Track Biological Age in the UK

When it comes to blood tests, a few key biomarkers keep popping up in the scientific literature and clinical practice for their predictive power in ageing:

• Inflammatory markers: High-sensitivity C-reactive protein (hs-CRP), Interleukin-6 (IL-6)
• Glycation and oxidative stress markers: HbA1c, Advanced Glycation End Products (AGEs)
• Metabolic panel: Lipid profile, fasting glucose, insulin, HOMA-IR (insulin resistance)
• Hormone levels: IGF-1, DHEA-S, testosterone/oestradiol balance
• Telomere length testing: though more niche and expensive, it can give a direct read on cellular ageing

Here’s the thing: no single test tells the full story, but combining these markers paints a vivid picture of your biological age. In the UK, many of these tests are available via private labs like Thriva or Medichecks, while some—like CRP and lipids—are offered on the NHS but may require a GP referral.

Inflammatory Markers: The Silent Age Accelerators

We know chronic inflammation escalates with age—sometimes called “inflammaging.” Elevated hs-CRP and IL-6 levels consistently correlate with higher biological age and risk of chronic diseases like cardiovascular disease and dementia (Franceschi et al., 2018).

In my experience, patients with hs-CRP levels above 3 mg/L often report more fatigue and slower recovery from illness. Ideally, you want hs-CRP under 1 mg/L for optimal health. If yours is high, anti-inflammatory lifestyle changes—think Mediterranean diet, regular exercise, and stress management—are essential.

These markers are well established, cheap, and routinely available in the UK. Just make sure your blood sample is fasting and taken early morning for consistency.

Glycation and Oxidative Stress: Measuring Sugar Damage

HbA1c is most famous as a diabetes diagnostic tool but is also a window into long-term blood sugar control and protein glycation, which accelerates ageing by damaging tissues. A healthy HbA1c in non-diabetics should be below 5.5% (37 mmol/mol in UK labs).

AGEs, or Advanced Glycation End Products, are less commonly tested but provide a direct measure of sugar-related protein damage. Unfortunately, AGEs testing isn’t widely available in standard UK labs yet and usually requires specialist research facilities.

That’s why I often recommend focusing on HbA1c plus oxidative stress markers like glutathione or malondialdehyde if you can get them. Keeping sugars low and antioxidants high can slow biological ageing considerably.

Metabolic and Hormonal Panels: The Longevity Cornerstones

Lipid profiles (total cholesterol, LDL, HDL, triglycerides) and fasting glucose levels remain cornerstones in assessing ageing-related metabolic health. Elevated LDL and triglycerides, or impaired glucose tolerance, are linked to accelerated vascular ageing.

But hormones often get overlooked. IGF-1, DHEA-S, and sex hormones decline with age, but their levels can signal if your body’s ageing in a balanced way or if pathological processes like sarcopenia (muscle loss) are kicking in.

I usually look for IGF-1 in the mid-normal range, as both low and excessively high levels increase risks. DHEA-S around 100-300 μg/dL (varies by lab) is reassuring. Hormone replacement or peptide therapies like those discussed in my peptides for longevity article may be options if levels are out of whack.

Telomere Length Testing: The DNA End Caps

Telomeres shorten as cells divide, making them sort of a biological clock. Testing telomere length can give an estimate of cellular age. However, quality varies widely between labs, and results can be influenced by sample handling.

In the UK, you can get telomere testing through private providers, but it’s on the pricier side (£150-£300). Honestly, it’s more informative when combined with other markers rather than standalone. If you want to explore telomere lengthening, be sure to read my comprehensive guide on effective supplements.

Comparison Table: Key Blood Tests for Longevity Biomarkers UK

Test	What it Measures	Normal UK Reference Range	Availability in UK	Typical Cost (Private)	Biological Age Relevance
hs-CRP	Chronic inflammation	< 1 mg/L (optimal); 1-3 mg/L (moderate)	NHS (GP referral), Private labs	£20-£40	High
HbA1c	Long-term blood sugar control	< 37 mmol/mol (5.5%)	NHS, Private labs	£20-£40	High
IL-6	Inflammatory cytokine	1-5 pg/mL (lab-dependent)	Private labs only	£50-£100	Moderate to High
Lipid Profile	Cholesterol, triglycerides	LDL < 3.0 mmol/L; HDL > 1.0 mmol/L	NHS, Private labs	£30-£60	High
IGF-1	Growth factor hormone	100-300 ng/mL (varies by age)	Private labs	£50-£80	Moderate
Telomere Length	Chromosome end length	No standardised range	Private labs	£150-£300	Moderate

Where to Get These Tests in the UK: NHS vs Private Options

The NHS does offer many of these tests—like lipid profiles, HbA1c, and CRP—but typically only if you have a clinical reason, such as a family history of heart disease or diabetes. For longevity tracking, most people turn to private testing services. Providers like Medichecks, Thriva, and Blue Horizon Medical offer extensive biomarker panels tailored for anti-ageing enthusiasts.

These companies often send you a home test kit, or arrange a blood draw at a local clinic, and deliver results digitally with health insights. Prices vary but expect to pay around £150-£400 for a comprehensive longevity panel.

One thing I always stress: don’t blindly order tests without a plan. Testing is only useful if you interpret the results correctly and act on them. It’s also wise to discuss findings with a knowledgeable clinician, especially before starting any new therapies.

Using Test Results to Manage Your Biological Age

Once you have your bloodwork, the real work begins. Elevated inflammatory markers? Focus on anti-inflammatory foods and stress relief. High HbA1c or insulin resistance? Time to dial back refined carbs and get moving. Hormone imbalances? Consider discussing replacement or peptide therapies, but under medical supervision. Low vitamin D or B12? Supplementation is straightforward and safe—UK guidelines recommend 400-800 IU vitamin D daily for most adults, higher if levels are very low (NHS.uk).

For anyone curious about pharmaceutical options, check out my detailed reviews on Metformin and Rapamycin—both of which show promise in slowing biological ageing but come with caveats and require medical oversight.

FAQ: Best Longevity Blood Tests to Track Biological Age UK

Final Thoughts

Tracking your biological age through blood tests is an empowering step toward proactive health management. While the NHS offers some of the basics, private testing fills in the gaps with detailed insights that help you target the root causes of ageing. If you’re considering supplements or therapies, I recommend starting with a solid testing foundation first—know your numbers before changing your regimen. Curious about supplement strategies? Don’t miss my latest guide on longevity supplements, or compare diets in my diet vs intermittent fasting article. Remember—the goal is to add life to your years, not just years to your life.

For authoritative info on ageing biomarkers and clinical guidelines, check out the National Library of Medicine review on ageing biomarkers.