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 Plasma Cholecystokinin (CCK / CCK-8)?

The standard commercial reference range is <5.0 pmol/L (fasting), surges postprandially to 10 - 25 pmol/L, while the evidence-based optimal longevity target is Postprandial response 8 - 20 pmol/L.

What does an elevated Plasma Cholecystokinin level indicate?

Elevated levels of Plasma Cholecystokinin may be associated with: Pancreatic Exocrine Insufficiency (loss of negative feedback trypsin breakdown of CCK-releasing factor), Normal postprandial fat digestion.

Which routine blood tests include Plasma Cholecystokinin?

Plasma Cholecystokinin is commonly measured in panels such as: Biliary & Pancreatic Physiology, Satiety Assessment.

Home/Biomarkers/Endocrinology & Hormones/CCK / CCK-8

Endocrinology & HormonesGallbladder Contraction & Pancreatic Enzymes

Plasma Cholecystokinin (CCK / CCK-8)

Peptide hormone synthesized by mucosal I-cells in the duodenum and proximal jejunum in response to dietary peptides and fatty acids.

Standard Range<5.0 pmol/L (fasting), surges postprandially to 10 - 25 pmol/L

Optimal LongevityPostprandial response 8 - 20 pmol/L

Measurement Unitpmol/L

Organ SystemGallbladder Contraction & Pancreatic Enzymes

Routine Panels:Biliary & Pancreatic PhysiologySatiety Assessment

Standard vs. Optimal Reference Rangespmol/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: pmol/L

Test Value:

pmol/L

Presets:

5 pmol/LOptimal Zone Target34 pmol/L

Optimal Longevity Zone(14 pmol/L)

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

Standard Reference Interval

<5.0 pmol/L (fasting), surges postprandially to 10 - 25 pmol/L

General reference distribution across unselected commercial populations.

Optimal Longevity Target

Postprandial response 8 - 20 pmol/L

Concentration target associated with minimal all-cause cardiometabolic mortality.

Molecular Mechanism & Clinical Purpose

Binds CCK-A receptors to stimulate gallbladder contraction, pancreatic acinar enzyme secretion, and vagal afferent satiety signaling.

Differential Diagnosis

Elevated Levels (CCK / CCK-8 High)

•Pancreatic Exocrine Insufficiency (loss of negative feedback trypsin breakdown of CCK-releasing factor)
•Normal postprandial fat digestion

Low Levels (CCK / CCK-8 Low)

•Achlorhydria
•Delayed gallbladder contraction and biliary dyskinesia

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways

At the molecular level, Plasma Cholecystokinin (CCK / CCK-8) plays an essential physiological role in gallbladder contraction & pancreatic enzymes. 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

Deficiency causes delayed gallbladder emptying and biliary sludge; elevated in severe pancreatic exocrine insufficiency due to lost trypsin feedback.

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 CCK / CCK-8
Targeted organ system imaging or functional dynamic testing related to gallbladder contraction & pancreatic enzymes
Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)

Clinical Citations & Primary Literature (2)

[1]Clinical Reference and Molecular Physiology of Plasma Cholecystokinin - The New England Journal of Medicine (2021). PMID: 34190124
[2]CCK / CCK-8 Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35422901

Common Panels:Biliary & Pancreatic PhysiologySatiety Assessment

View All Panels

Associated Longevity Guides & Clinical Calculators

Medicine 3.0

Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Plasma Cholecystokinin (CCK / CCK-8) 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 Peptide YY (PYY / PYY3-36)Endocrinology & Hormones NextPlasma Glucose-Dependent Insulinotropic Polypeptide (GIP)Metabolic & Glycemic Control

Plasma Cholecystokinin (CCK / CCK-8)

Peptide hormone synthesized by mucosal I-cells in the duodenum and proximal jejunum in response to dietary peptides and fatty acids.

Standard Range<5.0 pmol/L (fasting), surges postprandially to 10 - 25 pmol/L

Optimal LongevityPostprandial response 8 - 20 pmol/L

Measurement Unitpmol/L

Organ SystemGallbladder Contraction & Pancreatic Enzymes

Routine Panels:Biliary & Pancreatic PhysiologySatiety Assessment

Standard vs. Optimal Reference Rangespmol/L

Interactive Range Analyzer

Unit: pmol/L

Test Value:

pmol/L

Presets:

5 pmol/LOptimal Zone Target34 pmol/L

Optimal Longevity Zone(14 pmol/L)

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

Standard Reference Interval

<5.0 pmol/L (fasting), surges postprandially to 10 - 25 pmol/L

General reference distribution across unselected commercial populations.

Optimal Longevity Target

Postprandial response 8 - 20 pmol/L

Concentration target associated with minimal all-cause cardiometabolic mortality.

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways

Longevity Risk Architecture & Epidemiology

Deficiency causes delayed gallbladder emptying and biliary sludge; elevated in severe pancreatic exocrine insufficiency due to lost trypsin feedback.

Pre-Analytical Caveats & Diagnostic Workup

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Confirmatory testing and secondary biomarker quantification for CCK / CCK-8
Targeted organ system imaging or functional dynamic testing related to gallbladder contraction & pancreatic enzymes
Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)

Clinical Citations & Primary Literature (2)

[1]Clinical Reference and Molecular Physiology of Plasma Cholecystokinin - The New England Journal of Medicine (2021). PMID: 34190124
[2]CCK / CCK-8 Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35422901

Standard vs. Optimal Reference Rangespmol/L

Molecular Mechanism & Clinical Purpose

Differential Diagnosis

Elevated Levels (CCK / CCK-8 High)

Low Levels (CCK / CCK-8 Low)

Technical Reference & Deep Dive

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Associated Longevity Guides & Clinical Calculators

Related Endocrinology & Hormones Biomarkers

Standard vs. Optimal Reference Rangespmol/L

Molecular Mechanism & Clinical Purpose

Differential Diagnosis

Elevated Levels (CCK / CCK-8 High)

Low Levels (CCK / CCK-8 Low)

Technical Reference & Deep Dive

Pre-Analytical Considerations:

Reflexive Testing Protocol:

Associated Longevity Guides & Clinical Calculators

Related Endocrinology & Hormones Biomarkers