Beta-carotene blood test

The beta-carotene test measures the level of beta-carotene in the blood.

How the Test is Performed

A blood sample is needed.

Blood sample

Venipuncture is the collection of blood from a vein. It is most often done for laboratory testing.

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How to Prepare for the Test

Follow your health care provider's instructions about not eating or drinking anything for up to 8 hours before the test. You may also be asked not to eat anything with vitamin A (carotene) for 48 hours before the test.

Your provider may also tell you to temporarily stop taking medicines, such as retinol, which may interfere with test results.

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing and slight bruising. This soon goes away.

Why the Test is Performed

Beta-carotene is found in certain foods. It breaks down to become vitamin A in the body.

Your provider may order this test if you have signs that your vitamin A level may be too low, such as:

• Bones or teeth that do not develop correctly
• Dry or inflamed eyes
• Feeling more irritable
• Hair loss
• Loss of appetite
• Recurring infections
• Skin rashes
• Problems seeing at night

The test can also be used to help measure how well your body absorbs fats.

Normal Results

The normal range is 50 to 300 micrograms per deciliter (mcg/dL) or 0.93 to 5.59 micromoles per liter (micromol/L).

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test results.

What Abnormal Results Mean

A higher than normal level may be due to taking too much vitamin A ( hypervitaminosis A ).

Hypervitaminosis A

Hypervitaminosis A is having too much vitamin A in the body.

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Beta-carotene deficiency may occur if you are malnourished. It can also occur if your body has trouble absorbing fats through the digestive tract such as with:

• Chronic lung disease called cystic fibrosis

  Cystic fibrosis

  Cystic fibrosis is a disease that causes thick, sticky mucus to build up in the lungs, digestive tract, and other areas of the body. It is one of th...

  

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• Pancreas problems such as swelling and inflammation ( pancreatitis ) or the organ not producing enough enzymes (pancreatic insufficiency)

  Pancreatitis

  Acute pancreatitis is sudden swelling and inflammation of the pancreas.

  

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• Small intestine disorder called celiac disease

  Celiac disease

  Celiac disease is a condition caused by damage to the lining of the small intestine. This damage comes from a reaction to eating gluten. This is a ...

  

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This test plays a valuable role in diagnosing vitamin A deficiency. But the test results must be evaluated along with other clinical findings.

Risks

Veins and arteries vary in size from one person to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight but may include:

• Excessive bleeding
• Fainting or feeling lightheaded
• Hematoma (blood accumulating under the skin)
• Infection (a slight risk any time the skin is broken)