An empty clinic waiting room with wooden chairs and a large window

Most people meet these numbers as a line on a lab printout with a comment like "borderline — recheck in six months" and no explanation of what was measured or over what period. That is how a fixable trajectory becomes a diagnosis four years later.

These pages explain the markers themselves: what each test measures, what the Canadian thresholds are, why two tests can disagree, and which of them respond quickest to a change in weight, sleep, alcohol or activity. Nothing here diagnoses anything or replaces a clinician reading your results in context — the point is to walk into that conversation knowing what to ask.

Two things are worth saying before you read any of it. First, one abnormal result is not a diagnosis — every threshold on these pages assumes repeat testing, and a single reading taken on a bad week means very little. Second, the markers move at different speeds: blood pressure and fasting glucose respond within weeks to changes in weight, sleep and alcohol, while A1c reflects roughly three months and will not show your good fortnight at all. Judging a change by the wrong marker is how people conclude that nothing worked.

Where a result points at a specific condition, the deeper pages are elsewhere on the site: conditions covers PCOS and prediabetes, men's health covers fatty liver and visceral fat, and coverage covers who pays when treatment is involved.

Guides in this section

Prefer to see someone in person?

We list medical weight-loss clinics with a physical address and match you to one for free. Licensed clinicians decide eligibility — including for any medication discussion.

Build my plan & book — free BMI tool Clinic directory