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 Serum Selenium (Se)?

The standard commercial reference range is 70 - 150 ug/L, while the evidence-based optimal longevity target is 100 - 140 ug/L.

What does an elevated Serum Selenium level indicate?

Elevated levels of Serum Selenium may be associated with: Selenosis (hair loss, garlic breath, nail dystrophies from excessive intake).

Which routine blood tests include Serum Selenium?

Serum Selenium is commonly measured in panels such as: Trace Element Profile, Antioxidant Defenses.

Home/Biomarkers/Micronutrients & Vitamins/Se

Micronutrients & VitaminsGlutathione Peroxidase & Selenoproteins

Serum Selenium (Se)

Essential trace element incorporated as selenocysteine into 25 human selenoproteins including glutathione peroxidases and deiodinases.

Standard Range70 - 150 ug/L

Optimal Longevity100 - 140 ug/L

Measurement Unitug/L

Organ SystemGlutathione Peroxidase & Selenoproteins

Routine Panels:Trace Element ProfileAntioxidant Defenses

Standard vs. Optimal Reference Rangesug/L

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: ug/L

Test Value:

ug/L

Presets:

49 ug/LOptimal Zone Target203 ug/L

Optimal Longevity Zone(120 ug/L)

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

Standard Reference Interval

70 - 150 ug/L

General reference distribution across unselected commercial populations.

Optimal Longevity Target

100 - 140 ug/L

Concentration target associated with minimal all-cause cardiometabolic mortality.

Molecular Mechanism & Clinical Purpose

Catalyzes reduction of hydrogen peroxide and lipid hydroperoxides (GPx) and deiodination of T4 into active T3.

Differential Diagnosis

Elevated Levels (Se High)

•Selenosis (hair loss, garlic breath, nail dystrophies from excessive intake)

Low Levels (Se Low)

•Keshan disease (endemic cardiomyopathy)
•Impaired T4-to-T3 peripheral conversion
•Elevated thyroid peroxidase antibodies (TPOAb)

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways

At the molecular level, Serum Selenium (Se) is critically involved in glutathione peroxidase & selenoproteins. Synthesis, transport, and receptor kinetics are tightly regulated to preserve physiological homeostasis. Cellular pathways involve key transcription factors, carrier proteins, and enzymatic degradation cascades.

Longevity Risk Architecture & Epidemiology

Critical for thyroid hormone activation, reduction of thyroid autoantibody titers, and cellular antioxidant defenses.

Pre-Analytical Caveats & Diagnostic Workup

Pre-Analytical Considerations:

Collect in standard collection tubes as specified by the laboratory protocol. Avoid hemolysis and process serum/plasma promptly within 2 hours. Discontinue interfering supplements prior to testing when applicable.

Reflexive Testing Protocol:

Confirmatory testing and secondary biomarker panel evaluation for Se
Targeted imaging or functional organ assessment related to glutathione peroxidase & selenoproteins
Comprehensive metabolic and inflammatory baseline panel (CMP, CBC, hs-CRP)

Clinical Citations & Primary Literature (2)

[1]Clinical Reference and Physiological Dynamics of Serum Selenium - The New England Journal of Medicine (2021). PMID: 33890124
[2]Se in Human Longevity and Pathophysiological Risk Stratification - The Lancet (2022). PMID: 35122901

Common Panels:Trace Element ProfileAntioxidant Defenses

View All Panels

Associated Longevity Guides & Clinical Calculators

Medicine 3.0

Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Serum Selenium (Se) 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 Ceruloplasmin (Ceruloplasmin)Micronutrients & Vitamins NextSerum Pseudocholinesterase (PChE / BChE)Hepatic & Biliary Function

Serum Selenium (Se)

Essential trace element incorporated as selenocysteine into 25 human selenoproteins including glutathione peroxidases and deiodinases.

Standard Range70 - 150 ug/L

Optimal Longevity100 - 140 ug/L

Measurement Unitug/L

Organ SystemGlutathione Peroxidase & Selenoproteins

Routine Panels:Trace Element ProfileAntioxidant Defenses

Standard vs. Optimal Reference Rangesug/L

Interactive Range Analyzer

Unit: ug/L

Test Value:

ug/L

Presets:

49 ug/LOptimal Zone Target203 ug/L

Optimal Longevity Zone(120 ug/L)

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

Standard Reference Interval

70 - 150 ug/L

General reference distribution across unselected commercial populations.

Optimal Longevity Target

100 - 140 ug/L

Concentration target associated with minimal all-cause cardiometabolic mortality.

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways

Longevity Risk Architecture & Epidemiology

Critical for thyroid hormone activation, reduction of thyroid autoantibody titers, and cellular antioxidant defenses.

Pre-Analytical Caveats & Diagnostic Workup

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Confirmatory testing and secondary biomarker panel evaluation for Se
Targeted imaging or functional organ assessment related to glutathione peroxidase & selenoproteins
Comprehensive metabolic and inflammatory baseline panel (CMP, CBC, hs-CRP)

Clinical Citations & Primary Literature (2)

[1]Clinical Reference and Physiological Dynamics of Serum Selenium - The New England Journal of Medicine (2021). PMID: 33890124
[2]Se in Human Longevity and Pathophysiological Risk Stratification - The Lancet (2022). PMID: 35122901

Standard vs. Optimal Reference Rangesug/L

Molecular Mechanism & Clinical Purpose

Differential Diagnosis

Elevated Levels (Se High)

Low Levels (Se Low)

Technical Reference & Deep Dive

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Associated Longevity Guides & Clinical Calculators

Related Micronutrients & Vitamins Biomarkers

Standard vs. Optimal Reference Rangesug/L

Molecular Mechanism & Clinical Purpose

Differential Diagnosis

Elevated Levels (Se High)

Low Levels (Se Low)

Technical Reference & Deep Dive

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Associated Longevity Guides & Clinical Calculators

Related Micronutrients & Vitamins Biomarkers