BIOMARKERS AND CLINICAL QUESTIONS
Advanced Biomarker Tests After 45: What’s Worth Tracking?
More tests do not automatically mean better prevention. A useful biomarker answers a specific question and helps you and your clinician decide what, if anything, should change.
Start with the clinical decision a test would change
Choosing Wisely Canada’s family-medicine recommendations illustrate why testing needs a reason. An abnormal result can create follow-up work without necessarily improving care.
Broad commercial panels can mix established tests with exploratory measures. Treating all of them as equally actionable can lead to anxiety, unnecessary repeat testing or false reassurance.
Compare established tests with exploratory panels
Established risk information
Why it matters: Existing results may already answer the most useful questions.
Practical application / what to track: Bring current blood-pressure, glucose and lipid information if available, with dates and relevant treatment context. For laboratory results, keep the test name, units and the reporting lab’s reference range with the number. MedlinePlus explains laboratory units and reference ranges; ask your clinician whether results from different labs or methods can be compared rather than treating isolated numbers as equivalent.
ApoB and Lp(a)
Why it matters: Additional lipid information may be useful in selected risk discussions.
Practical application / what to track: Ask whether either would refine your assessment and change management; do not order them merely to complete a list.
Inflammation, hormones and nutrients
Why it matters: These results can depend heavily on symptoms and circumstances.
Practical application / what to track: Ask why a test is indicated and how illness, medicines or other factors might affect interpretation.
Biological-age panels
Why it matters: An exploratory aging estimate is not an established treatment target.
Practical application / what to track: Ask what evidence links the result to a useful clinical decision.
Follow-up and cost
Why it matters: The value of a test includes what happens afterward.
Practical application / what to track: Ask about confirmation, repeat timing, downstream tests and total cost before proceeding.
Avoid unnecessary testing and false reassurance
- Testing everything “just in case.”
- Interpreting one result without its context.
- Using a favorable result to dismiss symptoms.
- Repeating all tests after a fixed habit-review period.
A1C: Canadian diagnostic reference
- Units
- Percent (%)
- Prediabetes category
- 6.0–6.4%
- Diabetes threshold
- 6.5% or higher; confirmation and clinical interpretation are required as appropriate.
- Reference scope
- Diabetes Canada diagnostic criteria for adults; not a treatment goal or a pregnancy-specific reference.
- Personal target
- Discuss with your clinician. A diagnostic threshold and a treatment target serve different purposes.
A1C can be misleading in some circumstances, including conditions affecting red blood cells. For an asymptomatic person with a result in the diabetes range, repeat confirmation is generally required.
Questions for your primary care visit
- Is A1C an appropriate test for me?
- Does this result need confirmation with another test?
- What follow-up and individual target fit my situation?
Source for the A1C reference card
Screening for and Diagnosing Diabetes
- Source
- Diabetes Canada
- Evidence type
- Clinical practice guidance / diagnostic reference
- Primary link
- Read the diagnostic guidance
- DOI / PubMed
- Not applicable to this web reference.
- Key takeaway
- Diagnostic thresholds need confirmation and clinical context; they are not universal treatment goals.
Primary care discussion checklist
Use the questions that fit your situation. Keep personal health notes private and bring them through your clinic’s approved channel.
- What question does this test answer, and how would each possible result change care?
- What are the limitations and chances of needing confirmation?
- What follow-up interval and cost are appropriate for this specific test?
Next steps and related reading
Before ordering a panel, use the test-decision questions to record what each result would change, its limits, follow-up and cost. Bring existing results privately to your clinician rather than entering them on this website.
Educational guidance. Not medical advice.
Biological Age After 45: What It Means and What to Track
Read how biological age estimates differ from your age in years, and what is worth tracking.
Epigenetic Clocks After 45: What Biological Age Tests Can and Can’t Tell You
Read what an epigenetic age estimate can and cannot tell you before choosing a test.
Gut Microbiome After 45: What Your Gut Bacteria Can and Can’t Tell You
Explore gut-health basics and the limits of interpreting microbiome tests.
Evidence & Primary Sources
Original references and further reading are retained below. These include research and educational resources; inclusion is not a study-level appraisal or endorsement. See our evidence and editorial policy.
- Canadian Cardiovascular Society guidance
- Canadian Cardiovascular Society: Primary Prevention of Cardiovascular Disease in Adults (2026 clinical tool, PDF)
- Diabetes Canada: Screening for Diabetes in Adults
- Choosing Wisely Canada’s family-medicine recommendations
- Biomarkers of Aging Consortium: framework for evaluating biomarkers of ageing
Authorship and editorial disclosures. This editorial update does not claim a new independent medical review. Report a correction.
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