The Bloodwork You've Been Meaning to Get
You track your sleep with an Oura ring. You know your resting heart rate because your Apple Watch tells you every morning. You’ve checked your VO2 max at some point, or at least know what it is. You have strong opinions about protein intake and can probably name three adaptogenic mushrooms. But you have no idea what your cholesterol is.
You’re not sick. Nothing hurts. Nobody needs to lecture you about “being proactive.” You’ve just never gotten around to sitting in a chair at LifeLabs and letting someone fill a few vials, because nothing seems wrong and you’re not your parents yet. That’s reasonable. The most useful health data you could collect right now, though, isn’t on your wrist or in an app. It’s in a standard blood panel that takes 15 minutes at a lab, costs you nothing under OHIP, and produces numbers that tell you more about where your body is headed than a year’s worth of wearable data.
A blood marker you’ve probably never heard of
There’s a molecule in your blood called lipoprotein(a), abbreviated Lp(a) and pronounced “L-P-little-a.” Most doctors don’t routinely test for it. Most patients have never heard of it. It might be the single most useful cardiovascular marker you’ll learn about in your thirties, because unlike cholesterol or blood pressure or blood sugar, you can’t change it through diet or exercise. Your Lp(a) level is 70 to 90 percent genetically determined, meaning your number at 35 will be roughly your number at 65.
About 20 percent of the global population has elevated Lp(a), which translates to a two to threefold increased risk of heart attack and aortic valve disease, according to the National Lipid Association’s 2024 updated clinical guidance (lipidjournal.com/article/S1933-2874(24)00033-3/fulltext). That’s comparable to the risk from familial hypercholesterolemia, a condition that gets far more attention and screening. The NLA now recommends measuring Lp(a) at least once in every adult. One blood draw. One number. You know it for life.
Why does this matter before 40? A landmark 2024 study published in the New England Journal of Medicine (nejm.org/doi/full/10.1056/NEJMoa2405182) tracked 27,939 initially healthy women over 30 years and found that a simple combination of three blood markers, Lp(a), LDL cholesterol, and high-sensitivity C-reactive protein (a measure of inflammation), predicted cardiovascular events decades out. Each marker contributed independent information. People with all three elevated had dramatically higher risk than those with just one. Separately, the American College of Cardiology published a review the same year noting that cumulative exposure to cardiovascular risk factors, even at levels considered “normal,” produces subclinical atherosclerosis (silent plaque buildup in your arteries) starting in your twenties and thirties. The buildup compounds without symptoms. By the time it announces itself as chest pain or a cardiac event, you’re dealing with a much harder problem. Knowing your Lp(a) won’t change the number itself, but it changes how aggressively you manage everything else.
What the rest of the panel tells you
Your doctor in Ontario can write a single requisition that covers a lot of ground, all billed to OHIP. You already paid for this through taxes. Here’s what those numbers tell you.
Lipid panel. Total cholesterol, LDL (the one you want lower), HDL (the one you want higher), and triglycerides. The American Heart Association (heart.org/en/health-topics/consumer-healthcare/what-is-cardiovascular-disease/heart-health-screenings) recommends lipid testing every four to six years starting in your twenties, and more frequently if you have risk factors or family history. If you’re in your mid-thirties and have never had yours checked, you’ve got plenty of company, but you’re also missing one of the most basic cardiovascular benchmarks available. Your LDL at 33 becomes the reference point that makes your LDL at 43 meaningful. Without the first number, the second one tells you less.
Fasting glucose and HbA1c. These screen for diabetes and prediabetes. HbA1c measures your average blood sugar over the past two to three months by looking at how much glucose has attached to your hemoglobin. Diabetes Canada recommends screening every three years starting at 40, or earlier if you have risk factors: family history, South Asian or Indigenous ancestry, a BMI over 25. Prediabetes affects roughly one in three North American adults, and most of them have no symptoms whatsoever. The condition damages blood vessels, kidneys, and nerves for years before you notice anything. Catching it at the prediabetic stage means adjusting how you eat and how much you move. Catching it later usually means medication and monitoring for the rest of your life.
Thyroid function (TSH). This single test checks whether your thyroid is running at the right speed. Subclinical hypothyroidism, where the gland underperforms just enough to cause problems but not enough to set off alarms, affects 3 to 10 percent of adults. Peak incidence falls between ages 30 and 50, and it’s eight to nine times more common in women. The symptoms look like things you’d blame on a busy schedule or write off as burnout: fatigue that doesn’t respond to sleep, unexplained weight gain, brain fog, feeling cold constantly, thinning hair. One TSH measurement tells you whether it’s your thyroid or your lifestyle. When treatment is needed, it’s typically a daily hormone pill that costs about $15 a month.
Vitamin D. Living in Toronto makes this one close to inevitable. Statistics Canada data (statcan.gc.ca/o1/en/plus/5095-shedding-light-canadas-vitamin-d-levels) shows roughly 19 percent of Canadians have inadequate vitamin D levels, and younger adults aged 19 to 30 are more likely to be deficient than seniors. Peak deficiency hits between December and January, when 36 to 45 percent of the population drops below adequate levels. If you live in an apartment, work indoors, and don’t supplement, the math between October and April isn’t working in your favor. Low vitamin D affects bone density, immune function, and mood. A blood test tells you whether you need supplementation and at what dose, rather than guessing with whatever bottle looked right at Shoppers.
Complete blood count, kidney function, and liver enzymes round out the standard panel. These screen for anemia, early kidney problems, and liver changes that can result from medication, alcohol, or conditions you didn’t know about. Think of them as the background check on your major organ systems. Unremarkable when the numbers are normal. Potentially very useful when they’re not.
Why doing this at 33 matters more than doing it at 55
A single set of lab results is a snapshot. Two sets, taken a few years apart, are a trend. Your doctor at 42 will want to know whether your cholesterol has been drifting upward for a decade or jumped suddenly. They’ll want to know if your blood sugar has been slowly inching toward prediabetes or spiked after a rough year. That context changes the diagnosis, the urgency, and the approach to treatment. A cholesterol reading of 5.5 mmol/L means something very different depending on whether your previous reading was 4.2 or 5.3. The trajectory tells a story that the isolated number can’t.
Walk-in clinics can order bloodwork. They do it routinely. But they won’t have your results on file next year. They won’t compare this panel to the one you got three years ago, or notice that your LDL climbed from 2.8 to 3.6 around the time you stopped running and started ordering delivery three nights a week. That kind of pattern recognition is what a consistent care provider does, and it’s the part that falls apart when you’re stitching together care from whatever clinic has a slot open on a Wednesday afternoon. CIHI data from 2025 (cihi.ca/en/taking-the-pulse-measuring-shared-priorities-for-canadian-health-care-2025/primary-health-care-2025/most-canadians-have-a-regular-health-care-provider) shows only about 73 percent of Canadians aged 18 to 34 have a regular healthcare provider, compared to 91 percent of those over 65. For most people in their thirties, it’s not that they tried to find a family doctor and failed. They just never prioritized it, because nothing felt urgent enough. The Canadian healthcare system has options for changing that when you’re ready.
This takes less time than you think
The physical runs about 30 minutes. The blood draw at LifeLabs or Dynacare takes another 15, and you can usually walk in. Results come back within a week. You walk out with a set of baseline numbers that gets more valuable every year, the same way the first deposit in a retirement account does more work than the ones that come later. If you want to know what happens during the physical itself, we covered that in detail here.
If everything comes back normal, you’ve got reference numbers and clarity. You don’t need to think about it again for a year or two. If something’s off, you caught it at the stage where the fix is usually a conversation about lifestyle, a cheap supplement, or a minor adjustment, not a specialist referral and a prescription you’ll refill for the next four decades. That’s the practical difference between knowing and guessing. Your Oura ring can report that you slept 7 hours and 22 minutes last night. It can’t tell you that your LDL has been climbing since your late twenties, or that your thyroid is dragging, or that your vitamin D cratered last winter and never recovered. Those answers are in the bloodwork. The bloodwork is free. And the whole process takes less time than your last spin class.
If you’ve been meaning to get this done and want a doctor who’ll order the panel, explain the results, and keep them on file for next time, Button Health is accepting patients in the GTA. Visits are covered by OHIP.
Join our patient waitlist here.
Button Health is opening new clinics in the Greater Toronto Area. We’re building the kind of primary care practice where you can actually talk to your doctor about what’s happening in your life, not just your physical symptoms. If you’re looking for a family doctor who takes your health seriously, we’re accepting new patients.