Cholesterol & Heart Health
What does high LDL cholesterol mean?
The short answer
LDL cholesterol (low-density lipoprotein) is the 'bad' cholesterol that can build up in artery walls and narrow them. US guidelines call below 100 mg/dL optimal, 130 to 159 mg/dL borderline high and 160 mg/dL or above high. A high LDL usually reflects diet, genetics or another health condition, and it raises the long-term risk of heart attack and stroke.
What LDL measures
LDL (low-density lipoprotein) carries cholesterol from the liver to the rest of the body. When too much circulates, cholesterol builds up in artery walls as plaque, narrowing them over years. That is why LDL is the primary treatment target in the US ATP III guideline.
On many lab reports, LDL is calculated rather than measured, using the Friedewald equation: total cholesterol minus HDL minus triglycerides divided by 5, all in mg/dL. The equation is not valid when triglycerides are above 400 mg/dL (CDC); labs may then measure LDL directly, and your report may carry a note (testing.com). The 2018 US cholesterol guideline also recommended the newer Martin-Hopkins equation (CDC), so the method can vary by lab.
LDL ranges
These bands come from the National Cholesterol Education Program's ATP III guideline (NIH), also used by Cleveland Clinic and testing.com; the severe threshold is from the 2018 ACC/AHA cholesterol guideline.
| Result | Range |
|---|---|
| Optimal | Below 100 mg/dL |
| Near or above optimal | 100 to 129 mg/dL |
| Borderline high | 130 to 159 mg/dL |
| High | 160 to 189 mg/dL |
| Very highSevere hypercholesterolaemia in the 2018 ACC/AHA guideline | 190 mg/dL or above |
| Goal with known atherosclerosis (Cleveland Clinic)A treatment goal set by your doctor, not a general range | Below 70 mg/dL |
These bands are for adults. Your own LDL goal depends on your overall cardiovascular risk: ATP III sets lower goals for people with heart disease or diabetes. Reference ranges vary between laboratories, and the range printed on your own report takes priority. Ranges vary between laboratories, and the range printed on your own report takes priority.
What a high LDL result means
A high LDL means more cholesterol-carrying particles are circulating, which over years raises the risk of plaque, heart attack and stroke. How much it matters depends on what else is present: ATP III weighs LDL against smoking, blood pressure, low HDL, diabetes, age and family history of early heart disease.
An LDL of 190 mg/dL or above is severe hypercholesterolaemia in the 2018 ACC/AHA guideline. An inherited cause such as familial hypercholesterolaemia is then more likely, and doctors may suggest genetic testing or a lipid specialist (testing.com). A doctor can also add apoB and Lp(a) to refine risk.
Common causes
- Foods high in saturated and trans fats, such as fatty meats and fast food
- Overweight or obesity
- Familial hypercholesterolaemia, an inherited condition that causes very high LDL from birth
- Diabetes, chronic kidney disease, chronic liver disease or an underactive thyroid
- Some medicines, including some blood pressure and HIV medicines
- Age, and menopause in women
What a low LDL result means
A low LDL is usually good news, and Cleveland Clinic says a low result needs no changes. People on cholesterol-lowering medicine often aim for one. A very low LDL without treatment is uncommon and can come from malnutrition, an overactive thyroid, liver disease or rare inherited conditions such as abetalipoproteinaemia (testing.com).
What moves LDL
Nutrition
Cut saturated and trans fats from fatty meat and fast food, and eat more soluble fibre from fruit, vegetables and wholegrains (Cleveland Clinic). The ATP III lifestyle diet keeps saturated fat below 7% of calories and dietary cholesterol below 200 mg a day, with 10 to 25 g of soluble fibre a day.
Training
Aim for 30 minutes of aerobic exercise a day (Cleveland Clinic), or 150 minutes of moderate exercise a week (CDC). ATP III pairs activity with weight management as first-line lifestyle treatment for raised LDL.
Sleep and stress
Cleveland Clinic advises managing stress, which can raise LDL and lower HDL. Better sleep and lower stress also make the food and activity changes easier to keep.
Habits
Avoid all tobacco, including vaping (Cleveland Clinic), and keep alcohol to two drinks a day or fewer for men and one for women (CDC). LDL reflects what you do most days for months, not a strict week before a test.
How fast LDL can change
LDL responds to sustained change over weeks to months. For people without heart disease, ATP III gives lifestyle change about 3 months before doctors consider adding medicine, so a Day 90 re-test is a sensible checkpoint. If your LDL is calculated, a big change in triglycerides also moves the calculated figure, because the equation subtracts triglycerides divided by 5, so read the two together.
Before your test
- Fasting is usually not required for LDL (testing.com), but follow your lab's instructions and keep them the same for each test.
- If your triglycerides are above 400 mg/dL, the Friedewald calculation is not valid (CDC). Your report may carry a note, or the lab may measure LDL directly (testing.com).
- Some medicines can raise LDL (Cleveland Clinic). Never stop a medicine to change a result; tell your doctor what you take.
When to speak to your doctor
Speak to your doctor about an LDL above the range on your report, especially 160 mg/dL or above, or if you have heart disease, diabetes or a family history of early heart disease. An LDL of 190 mg/dL or above needs prompt review, because it can signal familial hypercholesterolaemia. High LDL is not an emergency in itself, but chest pain, sudden weakness on one side, a drooping face or slurred speech are: call emergency services straight away.
On the Wolfburgh panel
LDL Cholesterol is one of the 17 markers on the Wolfburgh blood panel. Your sample is collected at home with RedDrop One, an FDA-cleared collection device, and a licensed physician reviews every panel before your care team sees it.
The Nutritionist leads on saturated fat and fibre, the Trainer on activity and the Behaviour Specialist on making changes stick, while the Partner Physician reads LDL alongside total cholesterol, HDL, triglycerides and the LDL/HDL ratio. Because a calculated LDL depends on triglycerides, the two are read together at baseline and at the Day 90 re-test. Members re-test at Day 90, backed by the 90-Day Results Guarantee.
Common questions about LDL
What is a good LDL cholesterol level?
Under the US ATP III guideline, LDL below 100 mg/dL is optimal, 100 to 129 mg/dL near optimal, 130 to 159 mg/dL borderline high, 160 to 189 mg/dL high and 190 mg/dL or above very high. People with heart disease or diabetes usually have lower goals, such as below 70 mg/dL with known atherosclerosis. The range on your own lab report takes priority.
How can I lower my LDL cholesterol without medication?
Cut saturated and trans fats, eat more soluble fibre from fruit, vegetables and wholegrains, aim for 30 minutes of aerobic exercise a day, keep to a healthy weight, manage stress and avoid all tobacco, as Cleveland Clinic advises. ATP III gives these changes about 3 months before judging them. If you already take a cholesterol medicine, do not stop it without speaking to your doctor.
Is LDL measured or calculated on a blood test?
On many lab reports, LDL is calculated. The Friedewald equation takes total cholesterol, subtracts HDL, then subtracts triglycerides divided by 5, all in mg/dL. It is not valid when triglycerides are above 400 mg/dL, and some labs use newer equations or measure LDL directly instead. That is why LDL and triglycerides are best read together.
Can LDL cholesterol be too low?
For most people a low LDL is good news, and people on cholesterol-lowering treatment often aim for one. A very low LDL without treatment is uncommon and can point to malnutrition, an overactive thyroid, liver disease or a rare inherited condition. If yours is far below the range on your report and you are not on treatment, tell your doctor.
Sources
- National Heart, Lung, and Blood Institute (NIH). ATP III Guidelines At-A-Glance Quick Desk Reference
- American Heart Association / American College of Cardiology (PubMed). 2018 AHA/ACC Guideline on the Management of Blood Cholesterol
- Cleveland Clinic. LDL Cholesterol
- testing.com. LDL Cholesterol test
- CDC (National Center for Health Statistics). NHANES 2017 to March 2020: Cholesterol, LDL and Triglycerides data documentation
- CDC. Preventing High Cholesterol
This page is general information, not medical advice, and it does not replace a consultation with your own doctor. Never start, stop or change a medicine or supplement because of something you read here.
All 17 markers on the Wolfburgh panel
Cholesterol & Heart Health
- Total Cholesterol
- HDL Cholesterol
- LDL Cholesterol
- Triglycerides
- VLDL CholesterolCalculated
- LDL to HDL RatioCalculated
- Triglyceride to HDL RatioCalculated
- Total Cholesterol to HDL RatioCalculated
Blood Sugar
Inflammation
Iron
Liver Function
Proteins
Vitamins & Hormones
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