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Apolipoprotein - B

Also referred as

Apolipoprotein B-100

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For men & women

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18 hours

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An Apolipoprotein - B test checks the amount of apolipoprotein B (Apo B) in the blood. Apo B is a protein that helps carry cholesterol and fats (triglycerides) through the body. This test is done to check how healthy the heart is. It also helps find out the risk of heart-related problems like heart attack and stroke.

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No special preparation is required.

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Understanding Apolipoprotein - B

Apolipoprotein B, or Apo - B, is an essential protein that assists in transporting fats within the blood. It is primarily associated with low-density lipoprotein (LDL), or "bad cholesterol." Elevated levels of Apo - B may lead to plaque (fat buildup) in the arteries. This may raise the risk of heart attacks, strokes, and other heart conditions. That is why it is crucial to know the Apo-B level for maintaining heart health.

An Apolipoprotein - B test is useful when routine cholesterol tests are not providing sufficient information regarding heart health. Doctors might order this test if there are symptoms of heart issues, such as chest discomfort, shortness of breath, or rapid heartbeat. It can also be ordered if there are risk factors such as high blood pressure, high cholesterol, obesity, diabetes, or a family history of heart disease. This test also helps assess whether the treatment is effective in individuals with an existing heart condition. It can also be used to diagnose a very rare inherited disorder in which the body does not produce enough Apo B protein.

No fasting is required for this test. Eat and drink normally. Inform the doctor about any medicines or supplements being taken for heart problems, as they may affect test results. Always consult the doctor before making any changes to medication.

Test results can be slightly different depending on the lab. The doctor will explain what the result means. Based on the result, the doctor may plan a treatment or give advice on changes in lifestyle and medicines to manage the condition.

What does Apolipoprotein - B measure?

The Apolipoprotein - B test measures the level of Apo B in the blood. The protein helps in transporting fats and cholesterol within the body. Apo B is a central component of some fat-carrying particles in the blood, such as very low-density lipoprotein (VLDL), low-density lipoprotein (LDL), and chylomicrons. It binds to LDL or "bad" cholesterol, which may result in plaque developing in the blood vessels. This accumulation can lead to heart disease, which can become grave or life-threatening if left untreated.

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FAQs related to Apolipoprotein - B

Why is the Apolipoprotein - B test done?

This test is done to check your heart health. It helps find out if you are at risk for heart problems like heart attack, stroke, or blocked arteries.

Do I need to fast before taking the Apolipoprotein - B test?

No, fasting is not required. You can eat and drink as usual before this test.

How is the test performed?

A trained technician will clean the area on your arm and take a blood sample from a vein using a needle. The sample is then sent to the lab for testing.

Are there any risks associated with the Apo B test?

This test is safe and has very few risks. You might feel slight pain or bruising where the needle was inserted, but serious problems are rare.

How frequently should I undergo an Apolipoprotein - B test?

How often you need this test depends on your age, health, lifestyle, and family history. Talk to your doctor to know how often you should take it.

What can be the reasons for low Apo - B levels?

Low Apo - B levels can occur due to liver disease, overactive thyroid, some medicines, poor nutrition, or inherited health conditions.

What does it mean if my Apo-B levels are high?

High Apo - B levels mean you may have more LDL (bad cholesterol) in your blood. This can cause plaque buildup in your arteries and raise your risk of heart disease and stroke.

How can I lower my Apo B levels?

Talk to your doctor for the best advice. You may need medicine, but you can also improve your Apo B levels by eating a healthy diet, exercising regularly, keeping a healthy weight, quitting smoking, limiting alcohol, and reducing stress.

What is atherosclerosis?

Atherosclerosis is a condition where plaque made of cholesterol and other substances builds up in your arteries. This can block blood flow and lead to a heart attack or stroke.

Content created by

Dr. Swati Gupta (Anand)

MD Lab Medicine, MBBS

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Last Updated

15th Oct 2025