Longevity-tools.com

A free, self-service longevity toolkit

Precision health shouldn't be only for the top 1%. So I team up with the researchers behind the best published models and turn their work into free tools for interpreting lab results.

  • Best science, straight from the source
  • Used by labs and clinics
Interpret Blood Test Results
100% free and private. Instant results, no email required.
Zsolt Szabo
Zsolt Szabo Founder, Longevity-tools.com
Precision health consultant for labs and clinics
Video call with Dr. Peter K. Joshi and Zsolt Szabo
Humanity's Bortz Blood Age

Biological age from a routine blood test. Dr. Joshi co-authored the best-performing model built on standard lab tests. Methylation clocks can return different ages for the same blood sample, while these markers are reliable and also show how each organ system is doing.

The longevity-tools difference

What a standard lab report leaves out

LAB'S NORMAL RANGENormalOPTIMAL RANGEAbove optimalyour result

Normal is not optimal

The "normal" range on your lab report shows . Every biomarker here shows an optimal range for prevention and longevity.

TriglyceridesGGTBMIWaistRISK SCOREFLI

Best models for risk scoring

One marker rarely tells the whole story. Each tool combines several markers using the models that outperform the rest in head-to-head studies, built with their authors.

A1A2A3G1G2G3aG3bG4G5RecommendationSource: KDIGO

Clinical guidelines built in

Thousands of pages of clinical guidelines turned into rules. A recommendation appears only when your results call for it, with a citation to the guideline.

Interpreters and calculators

Precision health tools

Bio-age calculators

Humanity's Bortz Blood Age
The most advanced biological age calculator model based on blood tests available in commercial labs.
Levine PhenoAge Calculator
Biological age calculator from routine blood biomarkers prioritizing costs over precision.

Heart and Blood Vessels

CVD Risk Interpreter - PREVENT
Estimates cardiovascular risk from routine labs, explains the results and proposes personalized prevention strategies.
coming soon
Blood Pressure Interpreter
Guided protocols for measuring blood pressure in various positions and comprehensive analysis of results.
Calculated indexes
Risk-weighted ApoB
Optimal biomarker ranges
ApoA1ApoBCholesterol (Total)HDLLDLLp(a)Triglycerides

Blood Sugar

Glucose Metabolism Interpreter
Provides a comprehensive metabolic assessment of blood glucose control using a static multi-biomarker approach.
Calculated indexes
C-peptide/insulinHOMA-IRQUICKITriglyceride/HDLTyG
Optimal biomarker ranges
C-peptideGlucoseHbA1cInsulin

Liver and Gallbladder

Liver Function Blood Test Interpreter
Comprehensive liver function test interpretation tool that automatically calculates key liver health indexes and provides recommendations based on official clinical guidelines.
Calculated indexes
ANID/T Bilirubin RatioFIB-3FLILSSR-FactorTyG-BMI
Optimal biomarker ranges
AlbuminALPALTASTBilirubin (Direct)Bilirubin (Total)GGTLDH

Kidney

Kidney Health Interpreter
Comprehensive kidney function assessment combining blood and urine markers to visually interpret, stage and differentiate kidney dysfunction, while providing personalized risk predictions.
Calculated indexes
eGFRcreGFRcr-cyseGFRcyseGFRdiffuACRuPCR
Optimal biomarker ranges
CreatinineCystatin CUreaUric acid

Thyroid

Thyroid Function Interpreter
Comprehensive assessment of thyroid function blood tests with HPT axis visualizations designed to detect thyroid-related dysfunction early.
Calculated indexes
FT3/FT4 molar ratiofT3/rT3 ratioPTFQIPTFQI-FT3SPINA-GDSPINA-GTTSHI
Optimal biomarker ranges
fT3fT4rT3TPOAbTRAbTSH

Sex Hormones

Male Hormones Interpreter
Comprehensive male hormone interpretation that visualizes the testosterone production and feedback pathway to identify the true root cause of hormonal imbalances.
Calculated indexes
TT/E2
Optimal biomarker ranges
DHEASEstradiolFSHLHProlactinSHBGTestosterone (Free)Testosterone (Total)

Blood and Nutrients

new
B12 Status Interpreter
Combines vitamin B12 related markers into the cB12 indicator, estimates body B12 stores, and provides a personalized supplementation plan.
beta
Iron Status Interpreter
Calculates Body Iron Stores and provides a personalized intervention plan.
Optimal biomarker ranges
FerritinFolateHCTHGBHoloTCHomocysteineMCHMCVMMAPLTRBCRDWTransferrin SaturationVitamin B12Vitamin D - 25(OH)D

Body Measurements

Grip Strength Interpreter
Discover your grip strength percentile, evaluate its impact on mortality, and estimate the risk of future muscle weakness.
coming soon
Body Weight Interpreter
Analyzes body weight using multiple indexes, evaluates its impact on longevity, and calculates the optimal weight. Provides evidence-based nutrition and weight-loss recommendations.
Optimal biomarker ranges
Body fat

Immunity

No interpreter yet.
Optimal biomarker ranges
hsCRPLYMLymphocytes (Absolute)Monocytes (Absolute)Neutrophils (Absolute)WBC

Tumor Markers

No interpreter yet.
Optimal biomarker ranges
tPSA

Resources

new
GLP-1 Pen Click Calculator
Convert a target dose into clicks and view complete dose charts for common Ozempic, Wegovy, Mounjaro, and Zepbound pens.
Recommended Lab Tests for Longevity
Most impactful blood tests for optimal health.
How to Prepare for a Blood Test
What to do days before a blood draw to get the most accurate and comparable results.
For healthcare professionals

Bring longevity-tools into your lab or clinic workflow

  • One click, results prefilled
  • Triage at a glance
  • Your branding
  • Doctor-only context
  • Printable reports
  • No patient data transfer
For clinicsA clinical decision platform focused on prevention and longevity

Please send me relevant research and feedback.

Any feedback is welcome at .
I am particularly interested in research on biomarkers associated with all-cause mortality and on defining optimal reference ranges.