Cholesterol circulates in the blood. As the amount of cholesterol in your blood increases, so does the risk to your health. High cholesterol contributes to a higher risk of cardiovascular diseases, such as heart disease and stroke. That's why it's important to have your cholesterol tested, so you can know your levels. Blood cholesterol is measured in units called millimoles per litre of blood, or mmol/L. As a rough guide, the total levels should be: 5 mmol/L or less for healthy adults. 4 mmol/L or less for those at high risk. LDL levels should be: 3 mmol/L or less for healthy adults. 2 mmol/L or less for those at high risk. High cholesterol is a waxy substance found in your blood that can increase your risk of heart disease. It has no symptoms, but a blood test can detect it. You can lower your cholesterol with a healthy diet, regular exercise and sometimes medication. Learn more about the types, factors and complications of high cholesterol. Cholesterol: Top foods to improve your numbers. Diet can play an important role in lowering your cholesterol. Here are some foods to improve your cholesterol and protect your heart. By Mayo Clinic Staff Guide to healthy levels for different types of cholesterol; Result Healthy level; Total cholesterol: Below 5mmol/L: HDL (good cholesterol) Above 1.0mmol/L for men or above 1.2mmol/L for women: Non-HDL (bad cholesterol) Below 4mmol/L Summary Cholesterol levels vary by age, weight, and sex. They typically increase over time, and people over 20 should check their cholesterol levels every 5 years. The Centers for Disease pIZic.

what is a high cholesterol number