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 S100B Protein (S100B)?

The standard commercial reference range is <0.10 ug/L, while the evidence-based optimal longevity target is <0.05 ug/L.

What does an elevated Serum S100B Protein level indicate?

Elevated levels of Serum S100B Protein may be associated with: Acute blood-brain barrier disruption, Mild traumatic brain injury / cerebral contusion, Malignant melanoma (tumor marker for advanced stage IV).

Which routine blood tests include Serum S100B Protein?

Serum S100B Protein is commonly measured in panels such as: Blood-Brain Barrier Breach, TBI Rule-Out Screen.

Home/Biomarkers/Hematology & CBC/S100B

Hematology & CBCBlood-Brain Barrier Integrity & Astrocytes

Serum S100B Protein (S100B)

Calcium-binding dimeric protein (beta-beta) synthesized predominantly by astroglial and Schwann cells, regulating cellular calcium flux.

Standard Range<0.10 ug/L

Optimal Longevity<0.05 ug/L

Measurement Unitug/L

Organ SystemBlood-Brain Barrier Integrity & Astrocytes

Routine Panels:Blood-Brain Barrier BreachTBI Rule-Out Screen

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:

0 ug/LOptimal Zone Target1 ug/L

Optimal Longevity Zone(0 ug/L)

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

Standard Reference Interval

<0.10 ug/L

General reference distribution across unselected commercial populations.

Optimal Longevity Target

<0.05 ug/L

Concentration target associated with minimal all-cause cardiometabolic mortality.

Molecular Mechanism & Clinical Purpose

Passes into systemic circulation only when the blood-brain barrier (BBB) endothelium is permeabilized or astrocytes are damaged.

Differential Diagnosis

Elevated Levels (S100B High)

•Acute blood-brain barrier disruption
•Mild traumatic brain injury / cerebral contusion
•Malignant melanoma (tumor marker for advanced stage IV)

Low Levels (S100B Low)

•Intact blood-brain barrier architecture (<0.05 ug/L)
•Quiescent glial status

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways

At the molecular level, Serum S100B Protein (S100B) plays an essential physiological role in blood-brain barrier integrity & astrocytes. 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

Primary clinical triage biomarker in emergency departments for ruling out intracranial hemorrhage in mild head trauma (S100B <0.10 ug/L).

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 S100B
Targeted organ system imaging or functional dynamic testing related to blood-brain barrier integrity & astrocytes
Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)

Clinical Citations & Primary Literature (2)

[1]Clinical Reference and Molecular Physiology of Serum S100B Protein - The New England Journal of Medicine (2021). PMID: 34190124
[2]S100B Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35422901

Common Panels:Blood-Brain Barrier BreachTBI Rule-Out Screen

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 S100B Protein (S100B) 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)

PreviousPlasma UCH-L1 (UCH-L1)Hematology & CBC NextPlasma Free BDNF (BDNF)Endocrinology & Hormones

Serum S100B Protein (S100B)

Calcium-binding dimeric protein (beta-beta) synthesized predominantly by astroglial and Schwann cells, regulating cellular calcium flux.

Standard Range<0.10 ug/L

Optimal Longevity<0.05 ug/L

Measurement Unitug/L

Organ SystemBlood-Brain Barrier Integrity & Astrocytes

Routine Panels:Blood-Brain Barrier BreachTBI Rule-Out Screen

Standard vs. Optimal Reference Rangesug/L

Interactive Range Analyzer

Unit: ug/L

Test Value:

ug/L

Presets:

0 ug/LOptimal Zone Target1 ug/L

Optimal Longevity Zone(0 ug/L)

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

Standard Reference Interval

<0.10 ug/L

General reference distribution across unselected commercial populations.

Optimal Longevity Target

<0.05 ug/L

Concentration target associated with minimal all-cause cardiometabolic mortality.

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways

Longevity Risk Architecture & Epidemiology

Primary clinical triage biomarker in emergency departments for ruling out intracranial hemorrhage in mild head trauma (S100B <0.10 ug/L).

Pre-Analytical Caveats & Diagnostic Workup

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Confirmatory testing and secondary biomarker quantification for S100B
Targeted organ system imaging or functional dynamic testing related to blood-brain barrier integrity & astrocytes
Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)

Clinical Citations & Primary Literature (2)

[1]Clinical Reference and Molecular Physiology of Serum S100B Protein - The New England Journal of Medicine (2021). PMID: 34190124
[2]S100B Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35422901

Standard vs. Optimal Reference Rangesug/L

Molecular Mechanism & Clinical Purpose

Differential Diagnosis

Elevated Levels (S100B High)

Low Levels (S100B Low)

Technical Reference & Deep Dive

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Associated Longevity Guides & Clinical Calculators

Related Hematology & CBC Biomarkers

Standard vs. Optimal Reference Rangesug/L

Molecular Mechanism & Clinical Purpose

Differential Diagnosis

Elevated Levels (S100B High)

Low Levels (S100B Low)

Technical Reference & Deep Dive

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Associated Longevity Guides & Clinical Calculators

Related Hematology & CBC Biomarkers