Heart health isn’t captured by a single number. It’s a combination of metrics, from simple readings you can take at home to blood tests and imaging your doctor can order. Together, these measurements paint a detailed picture of how well your cardiovascular system is functioning and how likely it is to stay that way. Here’s what each one tells you and what the target numbers look like.
Blood Pressure
Blood pressure is the most fundamental measure of heart health, and one of the easiest to check. It reflects how much force your blood exerts against artery walls as your heart pumps. The reading comes as two numbers: systolic (the pressure during a heartbeat) over diastolic (the pressure between beats).
The 2025 guidelines from the American Heart Association and American College of Cardiology define four categories for adults:
- Normal: below 120/80 mm Hg
- Elevated: 120 to 129 systolic with diastolic still below 80
- Stage 1 hypertension: 130 to 139 systolic or 80 to 89 diastolic
- Stage 2 hypertension: 140 or higher systolic, or 90 or higher diastolic
If your systolic and diastolic numbers fall into different categories, the higher one is the one that counts. You should have your blood pressure checked at least once a year if it’s in the normal range. Many pharmacies have free monitors, and home cuffs are reliable enough for routine tracking between visits.
Resting Heart Rate
Your resting heart rate is how many times your heart beats per minute when you’re sitting still and calm. A normal range for adults is 60 to 100 beats per minute. Athletes and very fit individuals often have resting rates in the 40s or 50s, because a stronger heart pumps more blood per beat and doesn’t need to work as hard at rest.
A consistently elevated resting heart rate, even within the “normal” range, can signal that your heart is under more strain than it should be. Tracking it over time matters more than any single reading. If your resting rate trends downward as you get more active, that’s a tangible sign your cardiovascular fitness is improving.
Heart Rate Variability
Heart rate variability (HRV) measures the tiny fluctuations in time between consecutive heartbeats, fractions of a second that shift from one beat to the next. It’s not about your heart being irregular. It’s about your nervous system’s ability to fine-tune your heart rate in real time.
Higher HRV generally means your body adapts well to stress, exercise, and changing demands. People with high HRV tend to be less stressed and more resilient. Low HRV, on the other hand, suggests your body is struggling to adjust, and it’s associated with higher resting heart rates and greater risk of future health problems. Many smartwatches and fitness trackers now estimate HRV overnight, making it easy to monitor trends. The absolute number varies widely by age and individual, so your personal trend over weeks and months is more useful than comparing yourself to someone else.
Cholesterol and Lipid Levels
A lipid panel is a blood test that breaks down the fats circulating in your bloodstream. It’s one of the strongest predictors of your risk for heart attack and stroke. For adults 20 and older, healthy targets look like this:
- Total cholesterol: below 200 mg/dL
- LDL (“bad” cholesterol): below 100 mg/dL
- HDL (“good” cholesterol): 60 mg/dL or higher is ideal; below 40 mg/dL for men or 50 mg/dL for women is considered low
- Triglycerides: below 150 mg/dL
LDL is the number most closely linked to plaque buildup in your arteries, while HDL helps remove cholesterol from the bloodstream. Triglycerides, which come largely from dietary sugars and excess calories, compound the risk when they’re elevated alongside high LDL. If you’re at normal risk, the American Heart Association recommends a lipid panel every four to six years. If you have elevated risk factors like a family history of heart disease, diabetes, or obesity, your doctor will likely check more often.
Inflammation Markers
Cholesterol levels tell you how much plaque-building material is in your blood. Inflammation markers tell you how actively your arteries are being damaged. The most widely used test is high-sensitivity C-reactive protein (hs-CRP), which detects low levels of inflammation throughout the body.
A result below 2.0 mg/L puts you in a lower-risk category. At 2.0 mg/L or above, your risk of heart attack increases, and for people who’ve already had one, the risk of a repeat event goes up as well. This test is especially useful when your cholesterol numbers look borderline. Two people with identical LDL levels can have very different risk profiles depending on how much inflammation is happening in their artery walls.
Blood Sugar
High blood sugar damages blood vessels over time and is a major independent risk factor for heart disease. A fasting glucose test or an HbA1c test (which reflects your average blood sugar over the past two to three months) can catch problems early. The American Diabetes Association recommends testing for prediabetes starting at age 45, with repeat testing at least every three years if results are normal.
Even if you don’t develop full diabetes, chronically elevated blood sugar in the prediabetic range accelerates the hardening and narrowing of arteries. Catching it early gives you a window to reverse course through diet and exercise before lasting damage occurs.
Cardiorespiratory Fitness
Your body’s ability to use oxygen during sustained exercise, often expressed as VO2 max, is one of the most powerful predictors of how long you’ll live. A 46-year study published in the Journal of the American College of Cardiology tracked over 5,000 men and found that those with the highest cardiorespiratory fitness in midlife lived nearly five years longer than those with the lowest fitness levels. Each single-unit increase in VO2 max was associated with 45 extra days of life expectancy. The results held for cardiovascular death specifically, not just death from any cause.
You don’t need a lab to get a rough sense of where you stand. Many fitness watches estimate VO2 max from your heart rate data during runs or brisk walks. Clinical exercise tests provide more precise measurements, typically done on a treadmill while breathing into a mask. What matters most practically is whether you can sustain moderate activity, like brisk walking or cycling, for 30 minutes without significant breathlessness. If you can’t, improving your aerobic fitness should be a priority, because the mortality benefit of going from unfit to moderately fit is larger than almost any other lifestyle change.
Body Composition
BMI gets a lot of attention, but where you carry fat matters more than how much you weigh overall. Visceral fat, the kind that accumulates around your abdominal organs, is far more dangerous to your heart than fat stored in your hips or thighs. The simplest way to assess this is your waist-to-hip ratio: divide your waist circumference (measured at the narrowest point) by your hip circumference (at the widest point).
The World Health Organization flags a ratio of 0.90 or higher in men and 0.85 or higher in women as indicators of abdominal obesity, which is linked to significantly higher rates of heart attack. A basic tape measure gives you this number in under a minute, and tracking it over time can reveal cardiovascular risk that your scale misses entirely.
Coronary Artery Calcium Score
A coronary calcium scan uses a CT scanner to detect calcium deposits in the walls of your heart’s arteries. Calcium shows up where plaque has formed and hardened, giving a direct look at how much atherosclerosis has already developed. The result is a score:
- Zero: no calcium detected, suggesting a low chance of heart attack in coming years
- 1 to 99: mild plaque deposits
- 100 to 300: moderate deposits, associated with a relatively high risk of heart attack or other heart disease over the next three to five years
- Above 300: extensive disease and higher heart attack risk
This test isn’t routine for everyone. It’s most useful for people in a gray zone of risk, where traditional factors like cholesterol and blood pressure don’t clearly point toward or away from aggressive treatment. A score of zero can be reassuring enough to hold off on medication, while a high score can motivate both you and your doctor to act more decisively. The scan takes about 10 minutes, involves no injection or dye, and exposes you to a low dose of radiation comparable to a mammogram.
Putting the Numbers Together
No single test captures the full picture. Blood pressure and cholesterol are the foundation, easy to check and directly tied to treatment decisions. Resting heart rate and HRV add a real-time window into how well your heart and nervous system are functioning day to day. VO2 max tells you about your long-term trajectory. Inflammation and blood sugar reveal hidden damage that the other numbers might miss. And for people in middle age with uncertain risk, a calcium score can settle the question of whether plaque has already started building.
The most useful approach is layering these measurements over time. A single blood pressure reading at a stressful doctor’s visit means little on its own. But a pattern of readings across months, combined with your lipid panel, fitness level, and waist-to-hip ratio, gives you a genuinely reliable map of your cardiovascular health and where to focus your effort.