Whole-exome sequencing
What can protein-coding variants clarify about inherited risk, medication response, or carrier status?
Limitation: Most findings are not diagnoses, and uncertain variants can create more questions than answers.
Diagnostics education
Testing should change a decision.
These public educational guides explain what a diagnostic measures, when it may help, where it can mislead, and what decision a result could change. They are not a catalog and not a recommendation for every reader.
Guide library
Start with the question, not the test.
Each guide separates what a measurement can show from what it cannot settle on its own.
Genomics
Your sequence rarely tells you what to do by itself. It is most useful when it changes screening, medication choices, or a family-risk conversation.
Read the guide →
Biological Age
Aging clocks can be informative when followed as trends, but none can summarize a person or dictate a treatment plan.
Biological age testing
What do epigenetic, multi-omic, and immune-aging clocks claim to measure?
Limitation: Different clocks measure different signals, and a single score is not a clinical verdict.
SystemAge
Can DNA-methylation patterns add a useful view of aging across organ systems?
Limitation: Organ-age estimates are model outputs, not direct measurements of organ function or disease.
GlycanAge
What might IgG glycan patterns suggest about immune aging and inflammation?
Limitation: The signal is nonspecific and should not be read as a diagnosis or a stand-alone treatment target.
Cardiac Health
Cardiac imaging is not for everyone. Its value depends on baseline risk, symptoms, and whether seeing plaque would change prevention or follow-up.
Cardiac CT and CCTA
When can coronary CT clarify calcified plaque, noncalcified plaque, or narrowing?
Limitation: Radiation, contrast, incidental findings, and pretest probability all belong in the decision.
Coronary calcium score
Could a measure of calcified coronary plaque change a prevention decision?
Limitation: A score can miss noncalcified plaque and is not equally informative at every age or risk level.
Metabolic Health
Glucose data and blood markers can reveal patterns, but more data is useful only when the question and next decision are clear.
Continuous glucose monitoring
Can short-term glucose patterns clarify how meals, movement, sleep, or medication affect you?
Limitation: Brief monitoring can amplify normal variation, and interstitial readings are not the same as a diagnosis.
Longevity lab panels
Which metabolic, inflammatory, hormonal, or nutrient markers could change a real decision?
Limitation: Broad panels increase incidental abnormalities; marker selection and clinical context matter.
Environmental Exposures
Start with the source. Testing the environment often answers a more actionable question than testing the body.
PFAS and water testing
Should you test water, consider a PFAS blood level, change filtration, or skip testing?
Limitation: A body measurement may not identify the source or predict an individual health outcome.
Fitness & Body Composition
Aerobic capacity, muscle, bone, and visceral fat can add context beyond weight when the result will change training, nutrition, or medical follow-up.
VO2 max testing
Would peak oxygen uptake and threshold data change how you train or evaluate symptoms?
Limitation: Protocols and equipment differ, and the estimate is only useful when interpreted in context.
DEXA body composition
Could lean mass, bone density, or visceral-fat estimates change a health decision?
Limitation: Machine, protocol, and hydration differences can complicate comparisons across scans.
A practical framework
Before you order a test
A useful test begins with a decision pathway, not curiosity alone.
01
Define the question
Name the uncertainty you are trying to reduce. A vague wish to know everything is not yet a testing question.
02
Know what result would change
Before collecting data, identify the finding that would alter screening, treatment, training, or the choice to watch and wait.
03
Decide how it will be interpreted and followed
Plan who will weigh the result against your history, what uncertainty remains, and whether confirmation or follow-up is appropriate.
For the broader clinical principles behind this framework, read how Dr. Lin approaches context, evidence, and follow-up in the longevity practice philosophy.
Clinical care
Looking for current care availability?
Ask Dr. Lin's practice about a one-time consultation or membership. The practice confirms eligibility, availability, scope, and pricing by email. Reading these guides or sending an inquiry does not establish a physician-patient relationship.