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 Remnant Cholesterol (Remnant-C)?

The standard commercial reference range is < 30 mg/dL (Calculated: Total Cholesterol - HDL-C - LDL-C), while the evidence-based optimal longevity target is < 15 mg/dL.

What does an elevated Remnant Cholesterol level indicate?

Elevated levels of Remnant Cholesterol may be associated with: Type III hyperlipoproteinemia (ApoE2/E2 homozygosity), Postprandial lipidemia and metabolic syndrome, Hepatic insulin resistance.

Which routine blood tests include Remnant Cholesterol?

Remnant Cholesterol is commonly measured in panels such as: Calculated Lipid Profile, Cardiovascular Residual Risk.

Home/Biomarkers/Cardiovascular & Lipidology/Remnant-C

Cardiovascular & LipidologyTriglyceride-Rich Lipoprotein Atherogenicity

Remnant Cholesterol (Remnant-C)

Remnant cholesterol measures the cholesterol content of triglyceride-rich lipoproteins, namely VLDL remnants and chylomicron remnants.

Standard Range< 30 mg/dL (Calculated: Total Cholesterol - HDL-C - LDL-C)

Optimal Longevity< 15 mg/dL

Measurement Unitmg/dL

Organ SystemTriglyceride-Rich Lipoprotein Atherogenicity

Routine Panels:Calculated Lipid ProfileCardiovascular Residual Risk

Standard vs. Optimal Reference Rangesmg/dL

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: mg/dL

Test Value:

mg/dL

Presets:

0 mg/dLOptimal Zone Target41 mg/dL

Optimal Longevity Zone(7.5 mg/dL)

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

Standard Reference Interval

< 30 mg/dL (Calculated: Total Cholesterol - HDL-C - LDL-C)

General reference distribution across unselected commercial populations.

Optimal Longevity Target

< 15 mg/dL

Concentration target associated with minimal all-cause cardiometabolic mortality.

Molecular Mechanism & Clinical Purpose

These partially lipolyzed particles penetrate the arterial intima directly without requiring oxidative modification, causing immediate macrophage scavenger receptor uptake and foam cell formation.

Differential Diagnosis

Elevated Levels (Remnant-C High)

•Type III hyperlipoproteinemia (ApoE2/E2 homozygosity)
•Postprandial lipidemia and metabolic syndrome
•Hepatic insulin resistance

Low Levels (Remnant-C Low)

•Optimal fasting remnant clearance and high LPL activity

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways

At the cellular and molecular level, Remnant Cholesterol (Remnant-C) is central to lipoprotein particle assembly, apolipoprotein-receptor interactions, and subendothelial retention kinetics. Synthesis occurs primarily within hepatocytes and enterocytes, regulated by transcriptional co-activators (such as SREBP-2 and PPAR-alpha) and microsomal triglyceride transfer protein (MTP). Particle clearance is mediated through high-affinity endocytic receptors (including LDLR, LRP1, and scavenger receptors SR-B1). Circulating plasma half-life ranges from 2 to 4 days. Transcytosis across vascular endothelial cell monolayers occurs via scavenger receptor class B type 1 (SR-B1) and activin-like kinase 1 (ALK1), trapping particles within the subendothelial proteoglycan matrix where oxidative modification initiates foam cell formation.

Longevity Risk Architecture & Epidemiology

Elevated remnant cholesterol is causally associated with ischemic heart disease and accounts for substantial residual cardiovascular risk in patients with well-controlled LDL-C.

Pre-Analytical Caveats & Diagnostic Workup

Pre-Analytical Considerations:

Standard testing requires a 10 to 12 hour overnight fast to minimize postprandial chylomicron interference, although Remnant-C direct immunoassay is less sensitive to prandial state than calculated LDL-C. Avoid strenuous high-intensity exercise 24 hours prior to blood draw. Serum separator tubes (SST) or EDTA plasma should be centrifuged within 2 hours. High-dose biotin (>5 mg/day) supplementation may interfere with competitive streptavidin-biotin immunoassays, requiring a 48-hour washout period.

Reflexive Testing Protocol:

Advanced Lipoprotein Particle Quantification (NMR spectroscopy or ion mobility LDL-P)
Lipoprotein(a) [Lp(a)] baseline evaluation for genetic cardiovascular risk stratification
Coronary Artery Calcium (CAC) score via non-contrast cardiac CT to evaluate calcified plaque burden
High-sensitivity C-Reactive Protein (hs-CRP) to assess systemic vascular inflammatory tone
Carotid intima-media thickness (CIMT) duplex ultrasound to assess subclinical atherosclerosis

Clinical Citations & Primary Literature (1)

[1]Remnant Cholesterol as a Causal Risk Factor for Ischemic Heart Disease - JACC (2020). PMID: 32674768

Common Panels:Calculated Lipid ProfileCardiovascular Residual Risk

View All Panels

Associated Longevity Guides & Clinical Calculators

Medicine 3.0

Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Remnant Cholesterol (Remnant-C) 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

Serum Triglycerides

TG · < 80 mg/dL (Fasting)

Apolipoprotein B

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

Non-HDL Cholesterol

Non-HDL-C · < 90 mg/dL

PreviousApoB to ApoA1 Ratio (ApoB/ApoA1)Cardiovascular & Lipidology NextN-Terminal Pro-B-Type Natriuretic Peptide (NT-proBNP)Cardiovascular & Lipidology

Remnant Cholesterol (Remnant-C)

Remnant cholesterol measures the cholesterol content of triglyceride-rich lipoproteins, namely VLDL remnants and chylomicron remnants.

Standard Range< 30 mg/dL (Calculated: Total Cholesterol - HDL-C - LDL-C)

Optimal Longevity< 15 mg/dL

Measurement Unitmg/dL

Organ SystemTriglyceride-Rich Lipoprotein Atherogenicity

Routine Panels:Calculated Lipid ProfileCardiovascular Residual Risk

Standard vs. Optimal Reference Rangesmg/dL

Interactive Range Analyzer

Unit: mg/dL

Test Value:

mg/dL

Presets:

0 mg/dLOptimal Zone Target41 mg/dL

Optimal Longevity Zone(7.5 mg/dL)

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

Standard Reference Interval

< 30 mg/dL (Calculated: Total Cholesterol - HDL-C - LDL-C)

General reference distribution across unselected commercial populations.

Optimal Longevity Target

< 15 mg/dL

Concentration target associated with minimal all-cause cardiometabolic mortality.

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways

Longevity Risk Architecture & Epidemiology

Elevated remnant cholesterol is causally associated with ischemic heart disease and accounts for substantial residual cardiovascular risk in patients with well-controlled LDL-C.

Pre-Analytical Caveats & Diagnostic Workup

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Advanced Lipoprotein Particle Quantification (NMR spectroscopy or ion mobility LDL-P)
Lipoprotein(a) [Lp(a)] baseline evaluation for genetic cardiovascular risk stratification
Coronary Artery Calcium (CAC) score via non-contrast cardiac CT to evaluate calcified plaque burden
High-sensitivity C-Reactive Protein (hs-CRP) to assess systemic vascular inflammatory tone
Carotid intima-media thickness (CIMT) duplex ultrasound to assess subclinical atherosclerosis

Clinical Citations & Primary Literature (1)

[1]Remnant Cholesterol as a Causal Risk Factor for Ischemic Heart Disease - JACC (2020). PMID: 32674768

Standard vs. Optimal Reference Rangesmg/dL

Molecular Mechanism & Clinical Purpose

Differential Diagnosis

Elevated Levels (Remnant-C High)

Low Levels (Remnant-C Low)

Technical Reference & Deep Dive

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Associated Longevity Guides & Clinical Calculators

Related Cardiovascular & Lipidology Biomarkers

Standard vs. Optimal Reference Rangesmg/dL

Molecular Mechanism & Clinical Purpose

Differential Diagnosis

Elevated Levels (Remnant-C High)

Low Levels (Remnant-C Low)

Technical Reference & Deep Dive

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Associated Longevity Guides & Clinical Calculators

Related Cardiovascular & Lipidology Biomarkers