Cholesterol Numbers Explained: LDL, HDL, and What They Really Tell You
You got your bloodwork back and now you're looking at a list of numbers — total cholesterol, LDL, HDL, triglycerides, maybe even a ratio — with no real sense of what's fine and what isn't.
This is the second most common lab-results question I get, right behind blood sugar. Whether you're reviewing routine annual bloodwork or numbers your doctor flagged, here's a plain-language breakdown of what each value means, using Canadian Cardiovascular Society (CCS) guidance.
The Core Numbers
Total Cholesterol: the sum of all the cholesterol in your blood — HDL, LDL, and a portion of your triglycerides
LDL ("Lousy" cholesterol): the type that can build up in artery walls; targets vary based on your individual cardiovascular risk level, not a single one-size-fits-all number
HDL ("Healthy"/"Helpful" cholesterol): helps clear cholesterol from your bloodstream; generally, higher is better, with under 1.0 mmol/L flagged as a risk factor on its own
Triglycerides: a different type of blood fat, more closely tied to diet, alcohol, and blood sugar patterns than to genetics alone
Non-HDL Cholesterol: total cholesterol minus HDL — considered by CCS guidelines as an equally important (sometimes preferred) number to LDL, especially when triglycerides are elevated
The Ratio You Sometimes See
Some labs also calculate a Total Cholesterol/HDL ratio — it won't always appear on your requisition, but when it does, here's roughly how to read it (Dynacare – Total Cholesterol/HDL Ratio).
Below 3.5: below-average risk
3.5–5.0: average risk
Above 5.0: above-average risk
This ratio matters because it can catch something LDL alone might miss — for example, "normal" LDL paired with unusually low HDL still raises your risk, and the ratio reflects that where LDL by itself wouldn't (Mayo Clinic – Cholesterol Ratio or Non-HDL Cholesterol).
Cholesterol and Blood Pressure Move Together
Cholesterol and blood pressure are both pieces of the same cardiovascular risk picture, so it's common for one conversation to touch both. Blood pressure is its own topic, though — it's shaped by sodium, weight, activity, stress, and genetics all at once, and deserves its own deeper look rather than a few lines here. For now: if your cholesterol numbers are being monitored, it's worth asking your care team about blood pressure in the same conversation (Heart & Stroke Foundation – Managing Cholesterol).
"Not High Yet" Doesn't Mean "Nothing to Watch"
Like blood sugar, cholesterol can trend upward for years before crossing an official treatment threshold — and those thresholds actually shift depending on your personal cardiovascular risk profile, not just the raw number (Canadian Cardiovascular Society – 2021 Dyslipidemia Guidelines). Someone with diabetes, a family history of heart disease, or other risk factors may be treated at a lower LDL than someone without those factors. This is exactly why the same lipid panel can mean two different things for two different people — and why watching the trend in your own numbers over time matters more than comparing them to a single universal cutoff.
Two Myths That Keep People From Getting the Right Help
"It's genetic — so there's nothing I can actually do."
Genetics matter, but they're rarely the whole story. A few things move cholesterol just as much, and most people never hear about them.
Saturated fat has a bigger effect on your LDL than genetics does for most people — what's on your plate matters, regardless of family history.
Perimenopause is the one that catches women off guard most. As estrogen and progesterone start to decline, the liver becomes less efficient at clearing LDL from the bloodstream — so cholesterol can climb even when nothing about your diet or activity has changed. If you're in your 40s or early 50s and suddenly see a number you don't recognize, this is often why. It's not a mystery, and it's not something you did wrong.
Fatty liver disease — recently renamed MASLD (metabolic dysfunction-associated steatotic liver disease) — is closely tied to cholesterol levels too. The two conditions tend to travel together, each one making the other harder to manage (AASLD – New MASLD Nomenclature).
"Cut cholesterol from my diet, or take the pill — problem solved."
Neither is quite the full picture. Dietary cholesterol (the kind in eggs, for example) has a smaller effect on your blood cholesterol than saturated fat does for most people (Heart & Stroke Foundation – Managing Cholesterol) — so cutting it out while everything else stays the same often barely moves the number. And if you've been prescribed a statin or another medication, it's designed to work alongside lifestyle changes, not instead of them.
The medication and the plate both matter.
Where to Go From Here
If your numbers came back higher than you'd like, or trending the wrong way, your cardiologist or primary care provider is the right place to start for diagnosis, risk assessment, and any medication decisions — that part isn't optional, and it's where treatment targets specific to your risk level get set.
What often gets missed is the middle ground: the diet, lifestyle, and supplement-related pieces that can meaningfully move these numbers, and that a generalist visit rarely has time to fully unpack. That's where working with someone who focuses on this — sorting out which foods, patterns, and supplements are actually worth your effort, given your specific mix of factors — tends to make the difference between "I know I should eat better" and an actual plan you can follow.
This post is for general education and isn't a substitute for medical advice. Always discuss your individual lab results and cardiovascular risk with your doctor, cardiologist, or a registered dietitian.
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