The 10 Blood Markers Every Biohacker Should Track

Most people wait for symptoms to tell them something's wrong. Biohackers measure first, then optimize. Tracking biomarker changes gives a window into how lifestyle impacts health, wellness, and lifespan, allowing you to catch problems before they even start.

But not all blood markers are created equal. While there are dozens, or even hundreds, of biomarkers you could track, these 10 form the foundation of any serious optimization strategy. They're the metrics that move the needle on how you feel, perform, and age.

Why These 10 Markers Matter for Optimization

General health and optimal health are two very different things. General health is merely defined as the absence of disease. Optimization goes deeper. The goal of biohackers means looking for what is optimal for your own body, correcting test values before they turn into health symptoms.

Traditional medicine uses reference ranges that include 95% of the population. That means "normal" includes people who are sick, stressed, overweight, and sedentary. Many metabolic health and longevity researchers now target optimal ranges rather than conventional "normal" thresholds.

These 10 markers give you actionable data on your metabolic health, inflammation, nutrient status, and hormonal function. Track them consistently, and you'll see patterns emerge months before symptoms appear.

1. Fasting Glucose: Your Metabolic Foundation

Glucose control isn't just about diabetes prevention. It's about optimizing energy, cognitive function, and longevity. Carbohydrates raise blood sugar most directly, with high-glycemic foods causing faster, larger spikes than low-GI options.

Standard range: 70-100 mg/dL
Optimal range for biohackers: 72-85 mg/dL

Why the tighter range? Mean morning fasting glucose was 96.2 ± 12.87 mg/dL in 8,315 nondiabetic adults, but people with fasting glucose levels above 100 mg/dL may have impaired glucose tolerance. Staying in the lower optimal range supports better insulin sensitivity and metabolic flexibility.

To track fasting glucose properly, test after at least 8 hours without food. Both physical stress and emotional stress raise blood sugar, and poor sleep can produce measurably higher fasting glucose the next morning.

2. A1C: Your 3-Month Average

The A1C test measures average blood glucose over the past 2 to 3 months. Unlike single glucose readings, A1C can't be gamed by eating well for a few days before testing.

Standard range: Below 5.7% is normal, 5.7-6.4% indicates prediabetes, and 6.5% or higher suggests diabetes
Optimal range for biohackers: 4.5-5.6%

The A1C test measures the percentage of hemoglobin that has glucose attached to it, reflecting average glucose levels over the red blood cell lifespan of 90-120 days. This makes it impossible to manipulate with short-term dietary changes.

For optimization, you want your A1C in the lower end of the normal range. A landmark 30-year study found that CRP was the single strongest predictor of long-term cardiovascular events, but A1C remains crucial for metabolic health.

3. Fasting Insulin: The Hidden Metabolic Marker

Most doctors don't test insulin unless you're already diabetic. That's a mistake. Arina was able to bring his glucose levels down to optimal after experimenting with various biohacks, but insulin tells the deeper story of metabolic health.

Standard range: 2-25 µU/mL
Optimal range for biohackers: 2-5 µU/mL

High insulin is often the canary in the coal mine for metabolic dysfunction. You can have normal fasting glucose while your pancreas works overtime producing insulin to keep it there. This leads to insulin resistance, weight gain, and eventually type 2 diabetes.

Testing both glucose and insulin gives you the complete picture. The fasting insulin test reveals metabolic stress before glucose numbers climb.

4. Lipid Panel: Beyond Basic Cholesterol

Cardiovascular disease remains the leading cause of death globally. Your cholesterol levels are important because they help you know your risk for heart disease. But optimization requires looking beyond total cholesterol.

Key markers:
• LDL cholesterol: Below 100 mg/dL (below 70 mg/dL for high-risk individuals)
• HDL cholesterol: 60-80 mg/dL for optimal protection
• Triglycerides: Below 150 mg/dL

The Triglyceride/HDL Cholesterol Ratio is a good predictor of heart disease and can easily be calculated from the standard lipid profile. Divide your triglycerides by HDL. Most doctors want the ratio below 5:1, with below 3.5:1 considered very good.

The comprehensive lipid panel gives you the full cardiovascular risk picture. Keeping your LDL "bad" cholesterol low and HDL "good" cholesterol high helps lower your risk of heart disease and stroke.

5. hs-CRP: Your Inflammation Thermometer

Inflammation drives aging and disease. A study tracking nearly 28,000 initially healthy women found that cardiovascular risk increased linearly from the very lowest hs-CRP levels to the very highest, with those below 0.5 mg/L having the lowest risk.

Standard range: Below 1 mg/L is considered low cardiovascular risk, 1-3 mg/L is intermediate risk, and above 3 mg/L is high risk
Optimal range for biohackers: Below 0.5-1.0 mg/L

The real danger of CRP levels that are "normal" but not optimal isn't acute disease, it's the slow accumulation of damage across years and decades. This chronic low-grade inflammation drives accelerated biological aging.

Weight loss studies report a 0.25 mg/L decrease per 6.4 kg and heart-healthy dietary patterns can lower hsCRP significantly. The hs-CRP test gives you real-time feedback on your body's inflammatory state.

6. Vitamin D: The Optimization Essential

Vitamin D plays a huge role in our health, yet most don't have optimal vitamin D blood levels. Roughly 1 billion people are deficient globally. This isn't just about bone health.

Standard range: 30-100 ng/mL
Optimal range for biohackers: 50-90 ng/mL

Vitamin D levels should be between 60 and 80 ng/mL for optimal thyroid receptor and immune system function. During the COVID-19 pandemic, levels exceeding 30 ng/mL were associated with reduced severity and mortality.

The vitamin D test measures 25-hydroxy vitamin D, the storage form that reflects your true vitamin D status. Vitamin D levels below 20 ng/mL are deficient, with the strongest link to hair loss in alopecia areata.

7. Ferritin: The Iron Storage Paradox

Most people think more iron is better. Not always. Clinical laboratories provide upper limits of ferritin "normal ranges" that are too high for optimal future disease-risk reduction and longevity. Iron overload is a more common and dangerous problem than iron deficiency.

Standard range: Men: 20-300 ng/mL, Women: 20-150 ng/mL
Optimal range for biohackers: 40-70 ng/mL for investigation of hair loss, though many biohackers target the lower end of normal ranges

High ferritin levels have been associated with dysfunctional glucose metabolism, increasing diabetes risk fivefold in men and fourfold in women, plus doubling the risk of metabolic syndrome.

Blood donors show a negative correlation between donation frequency and mortality, with each additional yearly donation linked to a 7.5% decrease in mortality rate. The ferritin test helps you find the sweet spot between deficiency and excess.

8. TSH: Your Metabolic Master Switch

Thyroid hormones control every cell's energy pace. TSH (thyroid-stimulating hormone) is your window into thyroid function, but standard ranges are too wide for optimization.

Standard range: 0.45-4.5 mIU/L
Optimal range for biohackers: 1-2 mIU/L

The upper limit for TSH was once 10 uIU/mL, until the range 4.5-9.9 uIU/mL was revealed to be associated with dyslipidemia, vascular alterations, and diastolic dysfunction. Approximately 95% of healthy individuals maintain a TSH below 2.5 mU/L, and thyroid dysfunction is lowest with a TSH of 1-1.9 mU/L.

A TSH above 4.0-4.5 mIU/L can slow hair cycling, and a suppressed TSH below 0.4 mIU/L can also trigger diffuse shedding. The TSH test should be your first window into thyroid optimization.

9. Testosterone: The Performance Hormone

In men, optimal total testosterone ranges typically fall between 600-900 ng/dL, though symptoms and bioavailable testosterone levels matter more than total numbers alone. This isn't just about muscle and libido.

Standard ranges:
• Men: 300-1,000 ng/dL
• Women: 15-70 ng/dL

Optimal ranges for biohackers:
• Men: 600-900 ng/dL
• Women: 90-200 ng/dL

Women are losing 3% of their testosterone each year, with 70-90% lost by menopause. Twenty-year-old women once had testosterone levels between 70-90 ng/dL, but today's women show ranges between 8-30 ng/dL, dropping to 2-10 ng/dL by age 50.

The testosterone test reveals your hormonal foundation for energy, mood, and body composition. Testing is best done in the morning (7-10 AM) when testosterone peaks.

10. Estradiol: The Balancing Act

Estradiol matters for both men and women, just in different amounts. In men, estradiol is produced through the aromatization of testosterone and is critical for bone health, mood, and cardiovascular function. Low estradiol can lead to joint pain, depression, and osteoporosis, while high levels can contribute to water retention and mood swings. Optimal ranges often fall between 20-30 pg/mL.

Optimal ranges for biohackers:
• Men: 20-30 pg/mL
• Women: Varies by cycle and life stage

There seems to be a range of beneficial testosterone:estradiol ratios between 10 and 30, calculated as testosterone in ng/dL divided by estradiol in pg/mL. Higher values appear to be associated with improved spermatogenesis and reduced bone density while lower values are associated with thyroid dysfunction.

The balance between testosterone and estradiol affects everything from body composition to cognitive function. The goal isn't to eliminate estrogen but to find an optimal balance, which is why comprehensive lab testing is so critical.

Putting It All Together: Your Optimization Strategy

These 10 markers form your biological dashboard. If you track your basic blood biomarkers from year to year, you will see shifts and be able to make changes in diet and lifestyle to address them before symptoms appear.

The mistake many biohackers make is getting attracted to the shiny lights. There are exciting tests you can do, but they skip doing the basics when you really have to start with these fundamental markers.

Start with these 10, track them consistently, and optimize based on the optimal ranges, not just "normal" ones. Tracking biomarker changes gives a window into how lifestyle impacts health, wellness, and lifespan.

Want to get started? LevelPanel makes it simple to order these tests without a doctor visit, with results that don't go into your medical records or insurance. Your optimization journey starts with knowing your numbers.