Blood tests for longevity: the optimal panel and how often to test

Your annual check-up bloodwork comes back “normal.” Your doctor says everything looks fine. But here’s what most standard panels miss: the difference between “not sick” and “optimally aging” is enormous — and it lives in biomarkers your doctor probably isn’t ordering.

Standard blood panels were designed to detect disease. Longevity blood panels are designed to detect aging — years before disease appears. The biomarkers that predict how fast you’re aging are often different from the ones that diagnose illness, and the optimal ranges for longevity are significantly tighter than conventional reference ranges.

A 2025 consensus of 60 international aging researchers identified 14 key biomarkers of aging — many of which are simple, inexpensive blood tests. Combined with wearable data and lifestyle metrics, these tests form the foundation of a personalized longevity strategy.

What you’ll learn:

• Which blood biomarkers predict biological aging (and which are overrated)
• The optimal longevity ranges vs. conventional “normal” ranges
• How to build your testing panel by age and risk profile
• How often to retest for meaningful trend tracking

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Quick definition

Standard blood panels were designed to detect disease. Longevity blood panels are designed to detect aging — years before disease appears. The biomarkers that predict how fast you’re aging are often different from the ones that diagnose illness, and the optimal ranges for longevity are significantly tighter than conventional reference ranges.

Key takeaways

• Standard blood panels miss aging signals: Conventional “normal” ranges are too wide for longevity optimization — tighter optimal ranges reveal early aging
• The PhenoAge panel is your foundation: 9 inexpensive blood markers can calculate your biological age with validated accuracy
• Test annually from age 35: Establish baselines early and track trends over years, not single snapshots
• Trends reveal what snapshots hide: A marker moving in the wrong direction within “normal” range is a louder signal than a single outlier

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Why standard blood panels aren’t enough

Quick definition: A longevity blood panel measures biomarkers associated with the rate of biological aging, not just the presence or absence of disease — giving you actionable data years before symptoms appear.

The “normal” range problem

Standard laboratory reference ranges are based on the 95th percentile of the general population — including people with undiagnosed chronic conditions, metabolic dysfunction, and subclinical inflammation. Being “within range” means you’re not an outlier compared to an often-unhealthy population.

For example:

• Fasting glucose: Standard range is 70–99 mg/dL (3.9–5.5 mmol/L). But research shows that fasting glucose above 85 mg/dL (4.7 mmol/L) is already associated with increased cardiovascular risk and accelerated glycation
• hs-CRP: Standard “normal” is below 3.0 mg/L. But for optimal aging, you want below 1.0 mg/L — a threefold difference
• HbA1c: Standard range allows up to 5.6%. Longevity-focused physicians target below 5.2%

What longevity panels add

A longevity-focused panel goes beyond “are you sick?” to answer “how fast are you aging?” It includes:

1. PhenoAge biomarkers — the 9 blood markers used to calculate biological age
2. Metabolic health markers — insulin sensitivity, glucose regulation, lipid profiles
3. Inflammatory markers — chronic low-grade inflammation that drives aging
4. Hormonal markers — age-sensitive hormones that decline predictably
5. Micronutrient markers — deficiencies that accelerate specific aging pathways

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The essential longevity biomarkers

Tier 1: PhenoAge panel (biological age calculation)

These 9 biomarkers form the basis of the PhenoAge biological age calculation — one of the most validated epigenetic clock proxies available through simple blood tests.

Biomarker	Conventional range	Optimal longevity range	What it measures
Albumin	3.5–5.5 g/dL	4.3–5.0 g/dL	Liver function, nutritional status
Creatinine	0.7–1.3 mg/dL	0.8–1.1 mg/dL	Kidney function
Glucose (fasting)	70–99 mg/dL	72–85 mg/dL	Metabolic health
C-reactive protein (hs-CRP)	<3.0 mg/L	<1.0 mg/L	Systemic inflammation
White blood cell count	4,500–11,000/μL	4,500–7,000/μL	Immune activation
Lymphocyte %	20–40%	28–38%	Adaptive immunity
Mean cell volume (MCV)	80–100 fL	82–92 fL	Red blood cell size, B12/folate status
Red cell distribution width (RDW)	11.5–14.5%	11.5–13.0%	Red blood cell variation, inflammation
Alkaline phosphatase	44–147 U/L	45–85 U/L	Liver/bone health

Notice how the optimal longevity ranges are dramatically tighter than conventional ranges. A “normal” fasting glucose of 98 mg/dL (5.4 mmol/L) is technically fine by standard criteria but well outside the optimal window for slow aging.

Tier 2: Metabolic and cardiovascular markers

These biomarkers assess the metabolic and cardiovascular systems most closely linked to lifespan.

Biomarker	Optimal longevity range	Why it matters
Fasting insulin	2–6 μIU/mL	Insulin resistance precedes diabetes by 10–15 years
HbA1c	4.8–5.2%	3-month glucose average; glycation driver
ApoB	<80 mg/dL	Best single predictor of cardiovascular risk
Lp(a)	<30 nmol/L	Genetic cardiovascular risk (test once)
Triglycerides/HDL ratio	<1.5	Insulin resistance proxy
Homocysteine	<10 μmol/L	Methylation efficiency, cardiovascular and cognitive risk

Tier 3: Hormonal markers

Hormones decline predictably with age, but the rate of decline varies enormously and is modifiable. For a comprehensive guide to understanding and optimizing each hormonal axis — testosterone, estrogen, thyroid, cortisol, and insulin — see our complete guide to hormonal health and longevity.

Biomarker	Optimal longevity range	Why it matters
DHEA-S	Age-appropriate upper quartile	Adrenal reserve, correlates with all-cause mortality
Vitamin D (25-OH)	40–60 ng/mL (100–150 nmol/L)	Immune function, bone health, inflammation
IGF-1	100–180 ng/mL	Growth signaling — too high or too low accelerates aging
Cortisol (morning)	10–18 μg/dL	Stress axis regulation
Thyroid (TSH + Free T3/T4)	TSH 0.5–2.5 mIU/L	Metabolic regulation

Tier 4: Micronutrient and organ-specific markers

Biomarker	Optimal range	Why it matters
Vitamin B12	500–900 pg/mL	Neurological function, methylation
Ferritin	40–100 ng/mL (men), 30–80 ng/mL (women)	Iron stores — both deficiency and excess are harmful
Magnesium (RBC)	5.0–6.5 mg/dL	Enzyme cofactor for 300+ reactions
Omega-3 Index	8–12%	Cardiovascular and brain health
GGT	<25 U/L	Liver health, oxidative stress
Urea/BUN	7–18 mg/dL	Kidney function, protein metabolism

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The emerging biomarkers to watch

Longevity science is evolving rapidly. These biomarkers aren’t yet standard but are gaining clinical evidence.

GDF-15 (Growth Differentiation Factor 15)

Identified by the 2025 international expert consensus as one of the top aging biomarkers. GDF-15 rises with age and is associated with cardiovascular disease, frailty, and dysfunctional metabolism. Currently available through specialized labs.

Klotho

An anti-aging protein that supports kidney function, mineral balance, and brain health. Klotho levels decline with age, and higher levels consistently correlate with slower aging. Now available through some commercial longevity panels.

GlycanAge

Measures glycan modifications on IgG antibodies, reflecting chronic inflammation and immune aging. GlycanAge testing is becoming more accessible and provides a complementary view to PhenoAge.

CtBP2

A recently discovered blood molecule that tends to decline with age but remains elevated in people from long-lived families. Still primarily a research biomarker, but early evidence suggests it could become a longevity predictor.

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How to build your panel by age

Not everyone needs every test. Here’s a practical framework for building your longevity panel based on age and health goals.

Ages 25–35: baseline establishment

Priority: Establish your personal baselines before age-related changes begin.

Recommended panel:

• Complete PhenoAge panel (9 biomarkers)
• Fasting insulin + HbA1c
• Lipid panel with ApoB
• Lp(a) — test once (genetically determined, doesn’t change)
• Vitamin D, B12, ferritin
• Thyroid (TSH)

Frequency: Every 2 years

Ages 35–50: active monitoring

Priority: Detect early metabolic drift and optimize modifiable markers.

Gender-specific checklists: For a complete, prioritized screening guide at 40+, see the health checklist for men over 40 or the health checklist for women over 40, which include cancer screenings, hormonal assessments, and functional fitness tests alongside blood work.

Recommended panel: Everything above, plus:

• Homocysteine
• DHEA-S
• Full thyroid panel (TSH, Free T3, Free T4)
• GGT + AST/ALT
• Omega-3 Index
• Magnesium (RBC)
• IGF-1

Frequency: Annually

Ages 50–65: comprehensive surveillance

Priority: Track hormonal decline, cardiovascular risk escalation, and organ function.

Recommended panel: Everything above, plus:

• Morning cortisol
• Testosterone (men) / estradiol (women)
• Coronary calcium score (imaging, not blood — every 3–5 years)
• Cystatin C (more sensitive kidney marker than creatinine)
• GDF-15 (if available)

Frequency: Every 6–12 months

Ages 65+: enhanced monitoring

Priority: Catch rapid changes early and maintain functional independence.

Recommended panel: Full comprehensive panel, plus:

• NLR (Neutrophil-to-Lymphocyte Ratio) — immune aging and inflammation
• Prealbumin — nutritional status in older adults
• CBC with differential — anemia screening

Frequency: Every 6 months

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How often to test: the testing cadence

Testing too rarely misses trends. Testing too often wastes money and creates anxiety over normal fluctuations.

The optimal schedule

Marker type	Frequency	Rationale
PhenoAge panel	Every 6–12 months	Captures biological age trajectory
Metabolic markers	Annually	Detects insulin resistance, glycation trends
Lipid panel	Annually	Cardiovascular risk monitoring
Hormones	Annually (every 6 months if supplementing)	Tracks age-related decline
Micronutrients	Annually	Identifies developing deficiencies
Lp(a)	Once in lifetime	Genetically fixed
Inflammatory markers	Every 6 months	Inflammaging is a key driver

When to test more frequently

Increase testing to every 3–6 months if:

• You’ve made significant lifestyle changes and want to track results
• You’re on a supplement or hormone optimization protocol
• Your previous results showed a marker trending in the wrong direction
• You’re recovering from illness, injury, or a period of high stress

Practical tips for reliable results

• Always fast 12–14 hours before blood draws (water and black coffee are fine)
• Test in the morning (7–10 AM) when hormones and glucose are at their most consistent
• Avoid intense exercise for 48 hours before testing — it temporarily spikes inflammatory markers and liver enzymes
• Use the same lab for longitudinal comparison — different labs have different calibrations
• Request actual values, not just “normal/abnormal” flags

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How to interpret your results for longevity

Step 1: Compare to longevity ranges, not standard ranges

If your doctor says your fasting glucose of 97 mg/dL (5.4 mmol/L) is “normal,” they’re correct by disease-detection standards. But for longevity optimization, you want below 85 mg/dL (4.7 mmol/L). The tables above give you the longevity-specific targets.

Step 2: Look for trends, not snapshots

A single blood test is a photograph. Two or more tests are a movie. The direction of change matters more than any single value:

• Albumin dropping from 4.8 to 4.3 g/dL over 2 years → investigate even though both values are “normal”
• hs-CRP rising from 0.5 to 1.8 mg/L → inflammatory process developing, even though 1.8 is “within range”
• HbA1c creeping from 5.0 to 5.4% → metabolic health declining, even though still below the prediabetes cutoff

Step 3: Identify clusters

Aging rarely shows up as a single abnormal marker. Look for patterns:

• Metabolic cluster: Rising glucose + rising HbA1c + rising triglycerides + rising fasting insulin = insulin resistance developing
• Inflammatory cluster: Rising hs-CRP + rising WBC + rising NLR = chronic low-grade inflammation
• Nutritional cluster: Falling albumin + falling B12 + rising MCV = malabsorption or dietary deficiency
• Hormonal cluster: Falling DHEA-S + rising cortisol + poor sleep metrics = HPA axis dysfunction

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How SuperAge connects blood work to your biological age

Blood tests give you the biochemical picture. Wearable data gives you the functional picture. SuperAge bridges both.

PhenoAge integration

SuperAge uses the PhenoAge algorithm — built on the 9 blood biomarkers in Tier 1 above — to calculate your biological age from lab results. Enter your blood work and see exactly how your biochemistry maps to your rate of aging.

Wearable + blood work synergy

Your Apple Watch tracks HRV, resting heart rate, VO2 max, sleep, and activity continuously. SuperAge combines this real-time functional data with your periodic blood test results to give you a comprehensive biological age assessment — one that updates daily as wearable data flows in. For a practical guide to connecting all three data layers, see our article on building a personal health dashboard.

Track your interventions

Made a lifestyle change? Started a new exercise routine? Adjusted your diet? SuperAge tracks how these changes affect both your wearable metrics and your blood biomarkers over time, showing you what’s actually working to lower your biological age.

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For hs-CRP specifically, a one-off high result should be handled with the repeat-test guide so your trend is not built on an acute spike.

If you are choosing a remote or at-home panel rather than a clinician-ordered draw, use this home biomarker test comparison checklist to screen lab quality, sample type, repeatability, and privacy before buying.

For an age-banded yearly plan, use the annual longevity blood test checklist.

Before the draw, follow a preparation plan for a longevity blood test so the results are easier to compare.

Frequently asked questions

How much does a longevity blood panel cost?

A basic PhenoAge panel (9 markers) typically costs $50–150 through direct-to-consumer labs. A comprehensive longevity panel with 30+ markers ranges from $200–500. Many markers are covered by insurance as part of an annual physical — ask your doctor to add specific tests to your standard order.

Can I order these tests without a doctor?

In most US states, yes. Direct-to-consumer lab services allow you to order blood tests independently. However, interpretation — especially of hormonal and micronutrient results — benefits from working with a physician familiar with longevity medicine, particularly an integrative or functional medicine practitioner.

What’s the single most important blood test for longevity?

If you could only add one test to your annual panel, make it hs-CRP (high-sensitivity C-reactive protein). Chronic low-grade inflammation is the single biggest driver of biological aging, and hs-CRP is inexpensive, widely available, and highly predictive of all-cause mortality. A result below 1.0 mg/L is optimal.

How do I lower my biological age based on blood tests?

Focus on the markers furthest from their optimal longevity ranges. The most commonly actionable improvements include: reducing fasting glucose through diet and exercise, lowering hs-CRP through anti-inflammatory nutrition and stress reduction, optimizing vitamin D through supplementation, and improving lipid markers through dietary changes. Before supplementing, see our evidence-based longevity supplement guide for ranked evidence by compound and guidance on testing first.

Are at-home blood test kits accurate?

Finger-prick kits (capillary blood) are reasonably accurate for some markers (HbA1c, lipids, vitamin D) but less reliable for others (full CBC, hormone panels). For longevity tracking, venipuncture (standard blood draw) provides the most consistent and comprehensive results. Use at-home kits for monitoring between full panels, not as replacements.

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Key takeaways

• Standard blood panels miss aging signals: Conventional “normal” ranges are too wide for longevity optimization — tighter optimal ranges reveal early aging
• The PhenoAge panel is your foundation: 9 inexpensive blood markers can calculate your biological age with validated accuracy
• Test annually from age 35: Establish baselines early and track trends over years, not single snapshots
• Trends reveal what snapshots hide: A marker moving in the wrong direction within “normal” range is a louder signal than a single outlier

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Take control of your longevity bloodwork today

Your blood tells the story of how fast you’re aging — if you know which chapters to read. Start with the PhenoAge panel, track your trends, and combine lab results with daily wearable data for the most complete picture of your biological age.

Ready to connect the dots? Download SuperAge (App Store) and see how your blood biomarkers and Apple Watch data combine to reveal your true biological age.

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For a narrower decision guide, see Health markers to re-baseline at 60.

References

1. Perri G, et al. An Expert Consensus Statement on Biomarkers of Aging for Use in Intervention Studies. The Journals of Gerontology: Series A. 2025. https://doi.org/10.1093/gerona/glae297
2. Liu Z, et al. A new aging measure captures morbidity and mortality risk across diverse subpopulations from NHANES IV. PLOS Medicine. 2018. https://doi.org/10.1371/journal.pmed.1002718
3. Klemera P, Doubal S. A new approach to the concept and computation of biological age. Mechanisms of Ageing and Development. 2006. https://pubmed.ncbi.nlm.nih.gov/16318865/
4. Justice JN, et al. A framework for selection of blood-based biomarkers for geroscience-guided clinical trials. Geroscience. 2018. https://pmc.ncbi.nlm.nih.gov/articles/PMC6294998/
5. Krištić J, et al. Glycans are a novel biomarker of chronological and biological ages. The Journals of Gerontology: Series A. 2014. https://pmc.ncbi.nlm.nih.gov/articles/PMC4049143/
6. Sato M, et al. The secreted metabolite sensor CtBP2 links metabolism to healthy lifespan. Nature Aging. 2025. https://www.nature.com/articles/s43587-025-00973-4

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Last updated: 2026-06-07. This article is regularly reviewed to ensure accuracy.