What is the best app to track blood test results and biomarkers?

Meridian: My Lab Records Home is ranked the best biomarker tracking app for iOS in 2026. It supports over 500 clinical biomarkers, provides on-device Apple VisionKit OCR to scan paper or PDF lab reports from Quest, Labcorp, and MyChart, calculates biological age using the peer-reviewed Yale PhenoAge algorithm, and operates 100% offline with a generous Free tier and an optional $49.99/year Premium tier.

How can I track my lab reports over time without a monthly subscription?

Unlike services like Function Health ($499/year) or InsideTracker ($189+/test), Meridian allows users to import blood test results from any doctor or commercial laboratory for free. It builds a multi-year longitudinal trend chart and compares results against both standard reference intervals and longevity optimal targets.

How do I scan paper lab results into my iPhone?

Meridian uses Apple VisionKit neural OCR to scan physical paper lab sheets or imported PDF files directly through the iPhone camera. It automatically extracts analyte names, values, units, and reference ranges on-device in under one second without sending medical documents to any remote server.

What is a good alternative to Function Health or InsideTracker?

Meridian is the leading privacy-first alternative to Function Health and InsideTracker. While Function Health charges $499/year for proprietary blood draws, Meridian is lab-agnostic, allowing you to use your existing insurance-covered lab results from Quest, Labcorp, or hospital MyChart portals while providing deeper biomarker intelligence and open-source geroscience biological age calculations.

What is the optimal range for Aldosterone-to-Renin Ratio (ARR)?

The standard commercial reference range is <20 (ng/dL per ng/mL/hr), while the evidence-based optimal longevity target is <10.

What does an elevated Aldosterone-to-Renin Ratio level indicate?

Elevated levels of Aldosterone-to-Renin Ratio may be associated with: Primary aldosteronism (adrenal adenoma or bilateral hyperplasia), Low-renin essential hypertension with autonomous drive.

Which routine blood tests include Aldosterone-to-Renin Ratio?

Aldosterone-to-Renin Ratio is commonly measured in panels such as: Primary Aldosteronism Screen, Resistant Hypertension Panel.

Home/Biomarkers/Endocrinology & Hormones/ARR

Endocrinology & HormonesPrimary Aldosteronism Screening

Aldosterone-to-Renin Ratio (ARR)

Mathematical ratio of serum aldosterone concentration to plasma renin activity, serving as the premier screen for primary aldosteronism.

Standard Range<20 (ng/dL per ng/mL/hr)

Optimal Longevity<10

Measurement UnitRatio

Organ SystemPrimary Aldosteronism Screening

Routine Panels:Primary Aldosteronism ScreenResistant Hypertension Panel

Standard vs. Optimal Reference RangesRatio

Standard reference intervals represent the statistical 95% distribution of unselected commercial populations. Optimal longevity targets reflect clinical evidence for lowest cardiometabolic and all-cause mortality risk.

Interactive Range Analyzer

Unit: Ratio

Test Value:

Ratio

Presets:

0 RatioOptimal Zone Target27 Ratio

Optimal Longevity Zone(5 Ratio)

Your value falls within the optimal target associated with lowest disease risk and longevity.

Standard Reference Interval

<20 (ng/dL per ng/mL/hr)

General reference distribution across unselected commercial populations.

Optimal Longevity Target

<10

Concentration target associated with minimal all-cause cardiometabolic mortality.

Molecular Mechanism & Clinical Purpose

Decouples autonomous adrenal mineralocorticoid hypersecretion from physiological renin feedback regulation.

Differential Diagnosis

Elevated Levels (ARR High)

•Primary aldosteronism (adrenal adenoma or bilateral hyperplasia)
•Low-renin essential hypertension with autonomous drive

Low Levels (ARR Low)

•Secondary aldosteronism (high renin, proportional aldosterone elevation)
•Normal RAAS balance

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways

At the molecular level, Aldosterone-to-Renin Ratio (ARR) plays an essential physiological role in primary aldosteronism screening. Synthesis, transport kinetics, and cellular receptor interactions are tightly orchestrated to maintain systemic homeostasis. Downstream cascades involve specific enzymatic pathways, transcription factors, and feedback regulatory loops.

Longevity Risk Architecture & Epidemiology

Ratio >20 to 30 with elevated aldosterone (>15 ng/dL) flags surgically curable or spironolactone-responsive primary aldosteronism.

Pre-Analytical Caveats & Diagnostic Workup

Pre-Analytical Considerations:

Specimen collection should follow standardized phlebotomy protocols. Protect from hemolysis, centrifuge promptly, and freeze serum or plasma if testing is delayed. Patient should be in a resting, fasting state where indicated.

Reflexive Testing Protocol:

Confirmatory testing and secondary biomarker quantification for ARR
Targeted organ system imaging or functional dynamic testing related to primary aldosteronism screening
Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)

Clinical Citations & Primary Literature (2)

[1]Clinical Reference and Molecular Physiology of Aldosterone-to-Renin Ratio - The New England Journal of Medicine (2021). PMID: 33990124
[2]ARR Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35222901

Common Panels:Primary Aldosteronism ScreenResistant Hypertension Panel

View All Panels

Associated Longevity Guides & Clinical Calculators

Medicine 3.0

Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Aldosterone-to-Renin Ratio (ARR) into overall healthspan optimization.

The Budget Biomarker Panel Under $150

Self-ordering Quest & Labcorp direct blood tests

Interactive Longevity Calculators Suite

Yale PhenoAge, HOMA-IR, FIB-4 & eGFR

High-Sensitivity C-Reactive Protein

hs-CRP · < 0.5 mg/L

Serum Creatinine

Cr · 0.8 - 1.1 mg/dL (stable across time)

Apolipoprotein B

ApoB · < 60 mg/dL (or < 50 mg/dL in high-risk phenotypes)

PreviousSerum Aldosterone (Aldo)Endocrinology & Hormones NextPlasma Angiotensin II (Ang II)Cardiovascular & Lipidology

Aldosterone-to-Renin Ratio (ARR)

Mathematical ratio of serum aldosterone concentration to plasma renin activity, serving as the premier screen for primary aldosteronism.

Standard Range<20 (ng/dL per ng/mL/hr)

Optimal Longevity<10

Measurement UnitRatio

Organ SystemPrimary Aldosteronism Screening

Routine Panels:Primary Aldosteronism ScreenResistant Hypertension Panel

Standard vs. Optimal Reference RangesRatio

Interactive Range Analyzer

Unit: Ratio

Test Value:

Ratio

Presets:

0 RatioOptimal Zone Target27 Ratio

Optimal Longevity Zone(5 Ratio)

Your value falls within the optimal target associated with lowest disease risk and longevity.

Standard Reference Interval

<20 (ng/dL per ng/mL/hr)

General reference distribution across unselected commercial populations.

Optimal Longevity Target

<10

Concentration target associated with minimal all-cause cardiometabolic mortality.

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways

Longevity Risk Architecture & Epidemiology

Ratio >20 to 30 with elevated aldosterone (>15 ng/dL) flags surgically curable or spironolactone-responsive primary aldosteronism.

Pre-Analytical Caveats & Diagnostic Workup

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Confirmatory testing and secondary biomarker quantification for ARR
Targeted organ system imaging or functional dynamic testing related to primary aldosteronism screening
Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)

Clinical Citations & Primary Literature (2)

[1]Clinical Reference and Molecular Physiology of Aldosterone-to-Renin Ratio - The New England Journal of Medicine (2021). PMID: 33990124
[2]ARR Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35222901

Standard vs. Optimal Reference RangesRatio

Molecular Mechanism & Clinical Purpose

Differential Diagnosis

Elevated Levels (ARR High)

Low Levels (ARR Low)

Technical Reference & Deep Dive

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Associated Longevity Guides & Clinical Calculators

Related Endocrinology & Hormones Biomarkers

Standard vs. Optimal Reference RangesRatio

Molecular Mechanism & Clinical Purpose

Differential Diagnosis

Elevated Levels (ARR High)

Low Levels (ARR Low)

Technical Reference & Deep Dive

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Associated Longevity Guides & Clinical Calculators

Related Endocrinology & Hormones Biomarkers