It is also called a cholesterol Lp(a) test or an Lp(a) test.

This test measures the level of lipoprotein(a), or Lp(a), in your blood.

Lipoproteins are made of protein and fat. They carry cholesterol through your blood. Lp(a) is a type of low-density lipoprotein (LDL). LDL is known as "bad" cholesterol. High levels of Lp(a) can create plaque in your blood vessels. This is a buildup of cholesterol that reduces blood flow through your arteries. A high level of Lp(a) can be a sign of cholesterol-related disease, such as coronary artery disease. You can inherit an increased risk for high levels of Lp(a).

You may need this test if you have:

• Symptoms of heart disease.
• Family history of cardiovascular disease, such as heart attacks or strokes.
• Heart disease despite a normal lipid level.

You may need other tests to show your doctor how well your heart is working. These tests may include:

• A complete lipid or cholesterol profile.
• An electrocardiogram (ECG) to measure heart activity.
• A stress test to check your heart while you are exercising.
• An echocardiogram to show an image of your heart while it's beating.
• Cardiac catheterization to see if you have a clogged artery.

Test results may vary depending on your age, sex, health history, and other things. Your test results may be different depending on the lab used. They may not mean you have a problem. Ask your doctor what your test results mean for you.

Results are given in milligrams per deciliter (mg/dL). In most people, Lp(a) levels do not change much over their lifetime.

For most people, higher results are greater than 30 mg/dL. If your results are high, it may mean you are at an increased risk for cardiovascular disease.

The test is done with a blood sample. A needle is used to draw blood from a vein in your arm or hand.

Having a blood test with a needle carries some risks. These include bleeding, infection, bruising, and feeling lightheaded. When the needle pricks your arm or hand, you may feel a slight sting or pain. Afterward, the site may be sore.

Other factors aren't likely to affect your results.

You don't need to prepare for this test. But be sure your doctor knows about all medicines, herbs, vitamins, and supplements you are taking. This includes medicines that don't need a prescription and any drugs you may use.