Cholesterol levels: how to read a lipid panel

In short

• High cholesterol does not usually cause symptoms. A blood test is the only way to find out.
• LDL is the main target. Non-HDL cholesterol, which is total minus HDL, is another useful number.
• There is no single healthy number for everyone, because your clinician reads cholesterol alongside your other risk factors.
• Healthy eating, activity, a healthy weight and not smoking lower risk. Some people also need medicine.
• A family history of high cholesterol, heart attack or stroke may mean earlier and more frequent testing.

What cholesterol is

Cholesterol is a waxy, fat-like substance. Your body needs some of it to make hormones and to digest fats, and your liver makes all the blood cholesterol you need. It travels through the blood inside lipoproteins, mainly LDL and HDL.

High LDL can build up as plaque in the arteries. Plaque narrows them and can block blood flow, causing chest pain or a heart attack, and it also raises the risk of stroke. This builds up silently over years, which is why testing comes before symptoms.

What the lines of a lipid panel mean

• LDL, the so-called bad cholesterol: high levels can build up as plaque in the arteries.
• HDL, the so-called good cholesterol: higher levels may lower risk because HDL carries cholesterol to the liver to be removed.
• Triglycerides: a type of blood fat. High levels together with low HDL or high LDL raise heart attack and stroke risk.
• Total cholesterol: calculated from the HDL, LDL and triglyceride values.
• Non-HDL cholesterol: total minus HDL, and it can be measured fasting or not.
• Lipoprotein(a): not part of a routine panel. A provider may order it when there is a family history of stroke or early heart disease.

The NHLBI notes that a high lipoprotein(a) level can raise heart risk even when other cholesterol numbers are healthy, and it may lead to a statin prescription. Ask your provider which of these measures matter most for you, and which targets suit your situation.

Why there is no one healthy number

Higher-than-normal cholesterol and triglycerides may point to a higher risk of coronary heart disease, and your provider uses the results together with other risk factors. Risk factors include type 2 diabetes, obesity, a diet high in saturated and trans fats, inactivity, family history and smoking.

The NHS adds that you are more likely to have high cholesterol if you are over 50, a man, postmenopausal or of South Asian or sub-Saharan African origin. Age and family history cannot be changed, but the other factors can.

How often to test and how to prepare

The CDC says most healthy adults should be tested every 4 to 6 years, and people with heart disease, diabetes or a family history of high cholesterol need testing more often. Children should be tested at least once between ages 9 and 11, and again between 17 and 21.

• Ask your clinician whether to fast. You may be asked to fast for 8 to 12 hours, though a non-fasting sample works for some measurements.
• Tell your clinician about every medicine and supplement you take.
• Use the same lab for repeat tests, if you can, so the results are easier to compare.

What helps lower LDL

• Heart-healthy eating such as the DASH or TLC plans, which limit saturated fats and salt and favor whole grains, fruits, vegetables and nuts.
• Regular exercise, which can lower LDL and triglycerides and raise HDL.
• Weight loss of 3 to 5 percent of body weight can improve LDL and HDL in adults who are overweight or have obesity.
• Quitting smoking, limiting alcohol, managing stress and getting 7 to 9 hours of sleep a day.

The CDC points out that the body makes all the cholesterol it needs, so experts recommend limiting dietary cholesterol, which comes from animal foods such as meat, eggs and dairy.

When to see a doctor, and red flags

Ask your clinician about a cholesterol check if you have never had one, if you have diabetes or heart disease, or if a close relative had high cholesterol, a heart attack or a stroke. A family history may mean testing starts earlier, even in childhood, and the NHS notes that an inherited form called familial hypercholesterolaemia starts at a young age.

Call 911 for chest pain or pressure, trouble breathing, sudden weakness or numbness on one side of the body, or trouble speaking.

Medicines in general terms

• Statins are the most common treatment and lower heart attack and stroke risk in people with high LDL. They can raise the chance of diabetes, mainly in people already at high risk, and may affect liver enzyme tests. Serious muscle damage is rare.
• Ezetimibe and bempedoic acid are options if statins cause side effects or do not lower LDL enough.
• Bile acid sequestrants are another option when statins cannot be taken.
• PCSK9 inhibitors are injected medicines, often added to a statin for high-risk patients or those with familial hypercholesterolemia.

Treatment depends on your cholesterol levels, heart disease risk, other health conditions and lifestyle, and you and your provider set the plan together. The NHS says people usually take statins for life, so do not stop one without talking to your clinician.

Questions and answers

Sources

1. CDC — About Cholesterol
2. CDC — Testing for Cholesterol
3. NHLBI — Blood Cholesterol
4. NHLBI — Blood Cholesterol: Diagnosis
5. NHLBI — Blood Cholesterol: Treatment
6. NHS — High cholesterol

Sources checked on 29 October 2026.