A cholesterol result usually arrives as a short list of numbers and abbreviations, often with one or two flagged in bold. Each line measures something different, and none is a verdict on its own. Here is what each number means, the general ranges US and UK health services publish, how often to get tested and which everyday habits shift the results.
What does a cholesterol test measure?
The standard test is a blood test called a lipid panel or lipid profile. The National Heart, Lung, and Blood Institute (NHLBI) explains that it measures LDL cholesterol, HDL cholesterol and triglycerides, and that the report may also show non-HDL cholesterol. Here is what each line means:
- Total cholesterol: the overall amount of cholesterol in your blood, counting both LDL and HDL.
- LDL cholesterol: often called "bad" cholesterol. MedlinePlus describes it as the main source of the cholesterol buildup that blocks arteries.
- HDL cholesterol: often called "good" cholesterol, because it helps remove cholesterol from the arteries.
- Non-HDL cholesterol: your total cholesterol minus your HDL. It groups LDL together with other cholesterol-carrying particles such as VLDL.
- Triglycerides: a type of fat in the blood that the body uses for energy, according to the CDC.
A related marker, lipoprotein(a), is not usually part of a routine panel, the NHLBI notes. High cholesterol is something you learn about from a test rather than from how you feel. Over time, too much LDL can help build plaque on artery walls, narrowing them and raising the risk of heart disease and stroke. As the CDC puts it, "The only way to know whether you have high cholesterol is to get your cholesterol checked."
What are healthy cholesterol levels for adults?
The table below gathers general adult figures from three MedlinePlus pages (the lipid profile test, the triglyceride test and the cholesterol levels guide linked above), alongside the NHS guide to healthy levels used in the UK. US labs usually report in mg/dL, while the UK and many other countries use mmol/L.
| Measure | US guide (mg/dL) | US guide (mmol/L) | NHS guide (mmol/L) |
|---|---|---|---|
| Total cholesterol | Below 200 | Below 5.18 | Below 5 |
| LDL cholesterol | Below 100 for most adults | Below 2.59 | No figure given |
| HDL cholesterol | 60 or higher is best; below 40 (men) or 50 (women) is low | Above 1.55 is desirable | Above 1.0 (men) or 1.2 (women) |
| Non-HDL cholesterol | Below 130 | No figure given | Below 4 |
| Triglycerides | Below 150 is normal; 150–199 borderline high; 200–499 high; 500 or above very high | Below 1.69 is normal; 1.69–2.25 borderline high; 2.26–5.64 high; 5.65 or above very high | No figure given |
The US and UK figures are close but not identical. MedlinePlus also notes that normal ranges "may vary slightly among different laboratories", so the range printed on your own report is the one to compare against.
Why might your doctor set a different target for you?
The figures above are a general guide for healthy adults, not personal goals. The NHS says a good target depends on things like your age, any health conditions you have and your risk of cardiovascular disease. In the UK, a GP may combine cholesterol with age, blood pressure and other details into a QRISK score, which estimates the chance of a heart or circulation problem over the next 10 years.
LDL targets in particular get lower as risk rises. MedlinePlus lists an LDL goal below 70 mg/dL (1.81 mmol/L) for people at high risk, with diabetes or with other risk factors, and below 55 mg/dL (1.42 mmol/L) after a heart attack or stroke. The NHLBI's advice is simple: "Check with your provider on the lipid levels that are best for you."
Do you need to fast before a cholesterol test?
It depends on who orders the test. The CDC says you may need to fast for 8–12 hours, and MedlinePlus notes that without fasting, only the total and HDL results may be useful. The NHS, by contrast, says eating beforehand does not make much difference to its healthy levels. Follow the instructions you are given. It also helps to mention a recent illness, pregnancy or a recent birth, and any medicines or supplements you take, since these can shift results.
How often should you get your cholesterol checked?
How often depends on your age, risk factors and family history. The NHLBI sets out this general schedule:
| Age group | General testing schedule |
|---|---|
| Children and teens (19 or younger) | First check at ages 9–11, repeated every 5 years; as early as age 2 with a family history of high cholesterol, heart attack or stroke |
| Adults 20–65 | Every 5 years for younger adults; every 1–2 years for men 45–65 and women 55–65 |
| Over 65 | Every year |
The CDC gives a similar figure of every 4–6 years for most healthy adults, and says people with heart disease, diabetes or a family history of high cholesterol need checks more often.
Which everyday habits change cholesterol numbers?
Some influences are fixed. MedlinePlus notes that cholesterol tends to rise with age, that women's risk goes up after menopause and that high cholesterol can run in families. Others are within reach:
| Habit | What the evidence says |
|---|---|
| Eating pattern | The CDC says eating lots of foods high in saturated and trans fat may contribute to high cholesterol. The NHLBI favours eating plans that limit saturated fat from fatty meats, dairy and desserts and include whole grains, fruit, vegetables and nuts. |
| Soluble fibre | A meta-analysis of 67 controlled trials found that soluble fibre from oats, psyllium and pectin lowered total and LDL cholesterol. The effect at realistic intakes was small, so fibre helps as part of a wider pattern rather than on its own. |
| Physical activity | The NHLBI says activity can lower LDL and triglycerides and raise HDL. The CDC suggests adults get 2 hours and 30 minutes of moderate activity, such as brisk walking or cycling, each week. |
| Body weight | For adults with overweight or obesity, the NHLBI says losing just 3% to 5% of body weight can lower LDL and raise HDL. |
| Smoking | MedlinePlus notes that smoking lowers HDL, and the CDC says quitting lowers the risk of heart disease. |
| Alcohol | Too much alcohol can raise cholesterol and triglyceride levels, according to the CDC. |
| Sleep and stress | The NHLBI links 7–9 hours of sleep with a lower risk of high LDL and total cholesterol, and says chronic stress can sometimes raise LDL and lower HDL. |
For the food side, the anti-inflammatory plate shows a simple way to build meals around vegetables, whole grains, legumes and healthy fats, and how much fibre you need covers where fibre comes from. How much exercise you need breaks down the activity guidelines; the NHLBI suggests asking your provider what level of activity is right for you before starting a new programme. Some people also need medicine to reach their targets. That is a decision to make with a doctor, and MedlinePlus notes that lifestyle changes still count alongside it.
When should you talk to a doctor about your cholesterol?
Make an appointment with your doctor or practice nurse if any of these apply:
- You have never had a cholesterol test, or it has been longer than the schedule above suggests.
- Your report flags a result as high, low or borderline, or you are not sure what it means for you.
- Close relatives had heart disease or a heart attack at a young age. The CDC describes familial hypercholesterolemia as "an inherited condition that causes high blood levels of low-density lipoprotein (LDL) cholesterol". It affects about 1 in 311 people, and finding it early matters.
- You notice bumps or lumps around the knees, knuckles or elbows, or yellowish areas around the eyes, which the CDC lists among possible physical signs of that condition.
- You have diabetes or have had a heart attack or stroke, which usually means lower LDL targets and more frequent checks.
Cholesterol itself is not an emergency, but a heart attack is. The CDC advises calling 911 (or your local emergency number) right away for warning signs such as chest pain, pressure or discomfort lasting more than a few minutes; pain in the jaw, neck, back, arms or shoulders; shortness of breath; or feeling weak, light-headed or faint.
Cholesterol is one part of the heart picture. What a normal resting heart rate is covers another number worth knowing, and the full Heart & Circulation guide brings the rest together.
