ESR

Erythrocyte Sedimentation Rate

Does this test have other names?

ESR, sed rate

What is this test?

Erythrocyte sedimentation rate (ESR) is a blood test. It measures how quickly erythrocytes, or red blood cells, separate from a blood sample that has been treated so the blood will not clot. During this test, a small amount of your blood will be put in an upright tube. A lab specialist will measure the rate that your red blood cells settle toward the bottom of the tube after 1 hour.

If you have a condition that causes inflammation or cell damage, your red blood cells tend to clump together. This makes them heavier, so they settle faster. The faster your red blood cells settle and fall, the higher your ESR. A high ESR tells your healthcare provider that you may have an active disease process in your body.

Why do I need this test?

You may need this test if you have symptoms of one of the diseases that may cause ESR to go up.

You may also need this test if you have already been diagnosed with a disease that causes a high ESR. The test can allow your healthcare provider to see how well you are responding to treatment.

The ESR blood test is most useful for diagnosing or monitoring diseases that cause pain and swelling from inflammation. Other symptoms may include fever and weight loss. These diseases include:

Temporal arteritis
Rheumatoid arthritis
Polymyalgia rheumatica

ESR is not used as a screening test in people who do not have symptoms or to diagnose disease because many conditions can cause it to increase. It might also go up in many normal cases. ESR doesn't tell your healthcare provider whether you have a specific disease. It only suggests that you may have an active disease process in your body.

What other tests might I have along with this test?

You may have other tests if your healthcare provider is doing this test to diagnose a disease. One of these tests is call C-reactive protein, or CRP. This test also measures active inflammation in the body.

Your provider may do an ESR alone if he or she is monitoring a disease you already have.

Because ESR tells your provider only what is happening right now, you may need to have the test repeated over time.

What do my test results mean?

Test results may vary depending on your age, gender, health history, the method used for the test, and other things. Your test results may not mean you have a problem. Ask your healthcare provider what your test results mean for you.

ESR is measured in millimeters per hour (mm/h). The normal values are:

0 to 10 mm/h in children
0 to 15 mm/h in men younger than 50
0 to 20 mm/h in men older than 50
0 to 20 mm/h in women younger than 50
0 to 30 mm/h in women older than 50

ESR above 100 mm/h is most likely caused by an active disease. For instance, you may have:

A disease that causes inflammation in your body
Active infection
Cancer
Heart disease
Kidney disease
Blood disease
Diabetes
Collagen vascular disease

How is this test done?

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

Does this test pose any risks?

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.

What might affect my test results?

Many things that are not active diseases can increase your ESR. These include:

Pregnancy
Old age
Being female
Having a menstrual period
Having recently eaten a fatty meal
Being obese
Taking certain medicines

How do I get ready for this test?

You don't need to prepare for this test. Be sure your healthcare provider knows about all medicines, herbs, vitamins, and supplements you are taking. This includes medicines that don't need a prescription and any illicit drugs you may use. Tell your provider if you ate a fatty meal recently, if you are having your period, or if you may be pregnant.

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