A
cholesterol� test is a blood test that measures the amount of cholesterol and certain fats in your blood. Cholesterol is a waxy, fat-like substance that's found in your blood and every cell of your body. You need some cholesterol to keep your cells and organs healthy.� �Your liver makes all the cholesterol your body needs. But you can also get cholesterol from the foods you eat, especially meat, eggs, poultry, and dairy products. Foods that are high i
dietary fat� can also make your liver produce more cholesterol.� �There are two main types of cholesterol
low-density lipoprotein (LDL)�, or "bad" cholesterol, an
high-density lipoprotein (HDL)�, or "good" cholesterol.� �Too much LDL cholesterol in your blood increases your risk fo
coronary artery disease� and othe
heart diseases�. High LDL levels can cause the buildup of a sticky substance called plaque in your arteries. Over time, plaque can narrow your arteries or fully block them. When this happens, parts of your body don't get enough blood:� � �If the blood flow to the heart is blocked, it can cause
heart attack�.� �If the blood flow to the brain is blocked, it can cause
stroke�.� �If the blood flow to the arms or legs is blocked, it can caus
peripheral artery disease�.� � �Other names for a cholesterol test: Lipid profile, Lipid panel��What is it used for?� �A cholesterol test gives you and your health care provider important information about your risk of developing heart disease. If your test shows you have high cholesterol, you can take steps to lower it. This may decrease your risk of developing heart problems in the future. A cholesterol test measures:� � ��LDL levels.� Also known as the "bad" cholesterol, LDL is the main source of blockages in the arteries.� ��HDL levels.� Considered the "good" cholesterol, HDL helps get rid of "bad" LDL cholesterol.� ��Total cholesterol.� The combined amount of LDL cholesterol and HDL cholesterol in your blood.� ��Triglyceride levels.� Triglycerides are a type of fat found in your blood. Some studies show that high levels of triglycerides may increase the risk of heart disease, especially in women.� �
VLDL levels�.� Very low-density lipoprotein (VLDL) is another type of "bad" cholesterol. High VLDL levels have been linked to plaque buildup in the arteries. VLDL isn't usually included in routine cholesterol tests because it's difficult to measure. About half of VLDL is triglycerides, so your VLDL level can be estimated as a percentage of your triglyceride level.� ��Why do I need a cholesterol test?� �Your provider may order a cholesterol test as part of a routine exam. You may also have a cholesterol test if you have a family history of heart disease or if your risk for heart problems is high because of:� ��
High blood pressure�� �Type
diabetes���
Smoking�� �Excess weight o
obesity���
Lack of physical activity�� �A diet high in saturated fat� � �Your age may also be a factor, because your risk for heart disease increases as you get older.��What happens during a cholesterol test?� �A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.� �You may be able to use a
at-home kit� to check your cholesterol levels. Your kit will include a device to prick your finger to collect a drop of blood for testing. Be sure to follow the kit instructions carefully. Also, be sure to tell your provider if your at-home test shows that your total cholesterol level is higher than 200 mg/dl.��Will I need to do anything to prepare for the test?� �You may need t
fast� (not eat or drink) for 9 to 12 hours before your blood cholesterol test. That's why the tests are often done in the morning. Your provider will let you know if you need to fast and if there are any other special instructions.��Are there any risks to the test?� �There is very little risk to having a blood test. You may experience slight pain or bruising at the spot where the needle was put in, but most symptoms go away quickly.��What do the results mean?� �Cholesterol is usually measured in milligrams (mg) of cholesterol per deciliter (dL) of blood. The information below will help you understand what your test results mean. In general, low LDL levels and high HDL cholesterol levels are good for heart health.� �� ��Total Cholesterol Level� �Category�� � ���Less than 200mg/dL� �Desirable�� ��200-239 mg/dL� �Borderline high�� ��240mg/dL and above� �High���� �
| LDL（有害）胆固醇水平 | LDL 胆固醇分类 |
|---|---|
| 低于 100mg/dL | 最佳（对健康最有益） |
| 100-129mg/dL | 接近最佳 |
| 130-159 mg/dL | 边缘性偏高 |
| 160-189 mg/dL | 高 |
| 大于等于 190 mg/dL | 非常高 |
| HDL（有益）胆固醇水平 | HDL 胆固醇分类 |
|---|---|
| 大于等于 60 mg/dL | 被认为可以预防心脏病 |
| 40-59 mg/dL | 越高越好 |
| 低于 40 mg/dL | 心脏病的主要危险因素 |
结果中列出的 LDL 可能是“计算出来的”。这表示 LDL 水平是基于总胆固醇、HDL 和甘油三酯的估计值。LDL 水平也可以从血液样本中“直接”测定。不管怎样，都希望 LDL 数值低。
健康的胆固醇水平可能取决于年龄、家族史、生活方式和其他心脏病风险因素，如高甘油三酯水平。医疗保健提供者可以解释什么适合您。
了解更多关 实验室检测、参考范围和如何理解结果 的信息。