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 Tyrosine (Tyr)?

The standard commercial reference range is 30 - 90 umol/L, while the evidence-based optimal longevity target is 40 - 80 umol/L.

What does an elevated Serum Tyrosine level indicate?

Elevated levels of Serum Tyrosine may be associated with: Tyrosinemia Types I, II (oculocutaneous), and III, Transient tyrosinemia of the newborn.

Which routine blood tests include Serum Tyrosine?

Serum Tyrosine is commonly measured in panels such as: Amino Acid Profile, Neurotransmitter Precursors.

Home/Biomarkers/Endocrinology & Hormones/Tyr

Endocrinology & HormonesCatecholamine & Thyroid Precursor

Serum Tyrosine (Tyr)

Conditionally essential aromatic amino acid synthesized from phenylalanine by PAH, acting as the core precursor for catecholamines, melanin, and thyroid hormones.

Standard Range30 - 90 umol/L

Optimal Longevity40 - 80 umol/L

Measurement Unitumol/L

Organ SystemCatecholamine & Thyroid Precursor

Routine Panels:Amino Acid ProfileNeurotransmitter Precursors

Standard vs. Optimal Reference Rangesumol/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: umol/L

Test Value:

umol/L

Presets:

21 umol/LOptimal Zone Target122 umol/L

Optimal Longevity Zone(60 umol/L)

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

Standard Reference Interval

30 - 90 umol/L

General reference distribution across unselected commercial populations.

Optimal Longevity Target

40 - 80 umol/L

Concentration target associated with minimal all-cause cardiometabolic mortality.

Molecular Mechanism & Clinical Purpose

Hydroxylated to L-DOPA by tyrosine hydroxylase for dopamine/norepinephrine, and iodinated on thyroglobulin tyrosyl rings to form T4 and T3.

Differential Diagnosis

Elevated Levels (Tyr High)

•Tyrosinemia Types I, II (oculocutaneous), and III
•Transient tyrosinemia of the newborn

Low Levels (Tyr Low)

•Phenylketonuria (inadequate synthesis due to PAH block)
•Severe protein malnutrition

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways

At the molecular level, Serum Tyrosine (Tyr) plays an essential physiological role in catecholamine & thyroid precursor. 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

Assesses amino acid balance, catecholamine biosynthetic capacity, and guides nutritional management in PKU and tyrosinemia.

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 Tyr
Targeted organ system imaging or functional dynamic testing related to catecholamine & thyroid precursor
Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)

Clinical Citations & Primary Literature (2)

[1]Clinical Reference and Molecular Physiology of Serum Tyrosine - The New England Journal of Medicine (2021). PMID: 34090124
[2]Tyr Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35322901

Common Panels:Amino Acid ProfileNeurotransmitter Precursors

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 Tyrosine (Tyr) 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 Phenylalanine (Phe)Metabolic & Glycemic Control NextPhenylalanine to Tyrosine Ratio (Phe/Tyr)Metabolic & Glycemic Control

Serum Tyrosine (Tyr)

Conditionally essential aromatic amino acid synthesized from phenylalanine by PAH, acting as the core precursor for catecholamines, melanin, and thyroid hormones.

Standard Range30 - 90 umol/L

Optimal Longevity40 - 80 umol/L

Measurement Unitumol/L

Organ SystemCatecholamine & Thyroid Precursor

Routine Panels:Amino Acid ProfileNeurotransmitter Precursors

Standard vs. Optimal Reference Rangesumol/L

Interactive Range Analyzer

Unit: umol/L

Test Value:

umol/L

Presets:

21 umol/LOptimal Zone Target122 umol/L

Optimal Longevity Zone(60 umol/L)

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

Standard Reference Interval

30 - 90 umol/L

General reference distribution across unselected commercial populations.

Optimal Longevity Target

40 - 80 umol/L

Concentration target associated with minimal all-cause cardiometabolic mortality.

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways

Longevity Risk Architecture & Epidemiology

Assesses amino acid balance, catecholamine biosynthetic capacity, and guides nutritional management in PKU and tyrosinemia.

Pre-Analytical Caveats & Diagnostic Workup

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Confirmatory testing and secondary biomarker quantification for Tyr
Targeted organ system imaging or functional dynamic testing related to catecholamine & thyroid precursor
Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)

Clinical Citations & Primary Literature (2)

[1]Clinical Reference and Molecular Physiology of Serum Tyrosine - The New England Journal of Medicine (2021). PMID: 34090124
[2]Tyr Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35322901

Standard vs. Optimal Reference Rangesumol/L

Molecular Mechanism & Clinical Purpose

Differential Diagnosis

Elevated Levels (Tyr High)

Low Levels (Tyr Low)

Technical Reference & Deep Dive

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Associated Longevity Guides & Clinical Calculators

Related Endocrinology & Hormones Biomarkers

Standard vs. Optimal Reference Rangesumol/L

Molecular Mechanism & Clinical Purpose

Differential Diagnosis

Elevated Levels (Tyr High)

Low Levels (Tyr Low)

Technical Reference & Deep Dive

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Associated Longevity Guides & Clinical Calculators

Related Endocrinology & Hormones Biomarkers