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Understand what you measure

Make sense of biomarkers, tests and health trends

Understand laboratory results, wearable signals, screening notifications, reference ranges and changes over time without treating one number as a diagnosis.

66 published guidesBrowse the complete library

LongevityMate educational library for tests, biomarkers and health tracking

Tests, Biomarkers & Tracking

Published guides

Tests, Biomarkers & Tracking

66 results

In-depth guideBlood tests and biomarkers24-Hour Urine Protein: Test & ResultsUnderstand total protein in a 24-hour urine collection, how it differs from albumin and UACR, collection errors and what high results can mean.Updated Aug 31, 202614 minute read

In-depth guideBlood tests and biomarkersMethylmalonic Acid (MMA) TestUnderstand methylmalonic acid as a vitamin B12 marker. See why kidney function, specimen type, laboratory ranges and recent supplements matter.Updated Sep 13, 20265 minute read

In-depth guideBlood tests and biomarkersUrine pH: What Acidity Can and Cannot Tell YouLearn what a urine pH result describes, why a dipstick can differ from a meter, and why one reading cannot identify a kidney stone, infection or blood acidity.Updated Sep 26, 20267 minute read

In-depth guideBlood tests and biomarkersUrine Specific Gravity: What Concentration MeansUnderstand what urine specific gravity measures, why dipstick and laboratory methods differ, and why one result cannot diagnose dehydration or kidney disease.Updated Sep 26, 20267 minute read

In-depth guideBlood tests and biomarkers11-Deoxycortisol (Compound S): Test, Range & MeaningUnderstand what an 11-deoxycortisol blood test measures, why baseline, ACTH and metyrapone results differ, and how to interpret the result safely.Updated Aug 24, 202611 minute read

In-depth guideBlood tests and biomarkersCreatine Kinase (CK) Blood TestUnderstand a creatine kinase blood result, why exercise and timing matter, and how CK differs from creatinine. Read laboratory ranges with the right context.Updated Sep 10, 20265 minute read

In-depth guideBlood tests and biomarkersErythropoietin (EPO) Blood Test: Meaning and LimitsUnderstand how an EPO blood result relates to red blood cells, kidney signalling and oxygen, and why a standalone value cannot explain anemia.Updated Sep 27, 20266 minute read

In-depth guideBlood tests and biomarkersGlobulin Blood Test: High, Low and A/G RatioLearn what a globulin blood test measures, how calculated globulin and the A/G ratio differ, and how to read high or low results in context.Updated Sep 4, 202613 minute read

In-depth guideBlood tests and biomarkersAntinuclear Antibody (ANA) Test: Meaning, Patterns and LimitsA plain-English guide to antinuclear antibody testing, including titre, pattern, HEp-2 IFA, other assays, healthy positives and why the result needs clinical context.Updated Sep 5, 202612 minute read

In-depth guideBlood tests and biomarkersaPTT (PTT) Blood TestLearn what aPTT measures, why a prolonged clotting time does not always mean bleeding risk, and how medicines and sample quality affect the result.Updated Sep 11, 20265 minute read

In-depth guideBlood tests and biomarkersVitamin B6 (PLP) Blood TestUnderstand plasma PLP testing, preparation and supplement effects. See why laboratory intervals vary and a high B6 result does not alone diagnose nerve injury.Updated Sep 21, 20265 minute read

In-depth guideBlood tests and biomarkersH. pylori Stool Antigen Test: Results and TimingUnderstand H. pylori stool antigen results, the difference from breath, PCR and antibody tests, and why medicines and test-of-cure timing matter.Updated Sep 30, 20266 minute read

In-depth guideBlood tests and biomarkersMean Platelet Volume (MPV) Blood TestUnderstand mean platelet volume alongside platelet count. Learn why laboratory methods and sample timing matter, and why MPV alone cannot diagnose a cause.Updated Sep 12, 20265 minute read

In-depth guideBlood tests and biomarkersTransferrin Blood Test: Iron Transport and Result ContextLearn what measured transferrin means, how it differs from ferritin and transferrin saturation, and why inflammation and laboratory units matter.Updated Sep 8, 20265 minute read

In-depth guideBlood tests and biomarkersUric Acid Blood Test: High Results, Gout and MeaningUnderstand a uric acid blood test, high and low results, gout treatment targets, kidney excretion, urine testing and questions for your clinician.Updated Sep 4, 202613 minute read

In-depth guideBlood tests and biomarkersEosinophils: Absolute Count and PercentageUnderstand eosinophil counts and percentages, convert common units, and learn why the full blood count, symptoms, medicines and laboratory range matter.Updated Sep 8, 20265 minute read

In-depth guideBlood tests and biomarkersTotal Protein Blood Test: High, Low and A/G ContextLearn what a total protein blood test measures, how albumin and globulin shape A/G context, and how to read high or low results safely.Updated Sep 4, 202613 minute read

In-depth guideBlood tests and biomarkersUACR Test: Urine Albumin-Creatinine Ratio ExplainedUnderstand what a UACR urine test measures, the A1 to A3 categories, why repeat testing matters, and how UACR works with eGFR to assess kidney health.Updated Aug 27, 202614 minute read

In-depth guideBlood tests and biomarkers24-Hour Urine Creatinine: Test & ResultsUnderstand a 24-hour urine creatinine result, collection accuracy, units, creatinine clearance and why muscle mass and kidney context matter.Updated Aug 31, 202613 minute read

In-depth guideBlood tests and biomarkersBUN Blood Test: High, Low & Kidney ContextUnderstand blood urea nitrogen (BUN), why hydration and protein affect it, and how creatinine, eGFR, urine albumin and trends clarify a result.Updated Aug 29, 202614 minute read

In-depth guideBlood tests and biomarkersBUN/Creatinine Ratio: What the Blood Test AddsUnderstand how blood urea nitrogen and creatinine form a ratio, what can shift either value, and why eGFR and the full kidney assessment matter.Updated Sep 25, 20267 minute read

In-depth guideBlood tests and biomarkersESR Blood Test: High, Low and What Results MeanLearn what an erythrocyte sedimentation rate (ESR) measures, how Westergren and alternate methods differ, and why age, sex, pregnancy and anaemia matter.Updated Sep 3, 202614 minute read

In-depth guideBlood tests and biomarkersFree T3 (FT3) Blood TestUnderstand free T3 alongside TSH and free T4. Learn why assay methods, illness and biotin matter, and why FT3 is not a personal metabolism target.Updated Sep 11, 20265 minute read

In-depth guideBlood tests and biomarkersIgM Blood Test: Total Immunoglobulin M ExplainedUnderstand total IgM, high and low results, laboratory ranges and units, and how this blood test differs from infection-specific IgM antibodies.Updated Oct 1, 20264 minute read

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