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Erythrocyte Sedimentation Rate


Erythrocyte Sedimentation Rate (ESR)

## Erythrocyte Sedimentation Rate (ESR) Test

The Erythrocyte Sedimentation Rate (ESR) test, also known as a sed rate, measures how quickly red blood cells (erythrocytes) settle to the bottom of a test tube in one hour[1]. This test is used to detect inflammatory activity in the body, as inflammation can cause red blood cells to clump together, making them heavier and causing them to settle faster[1]. The test is often used alongside other tests to help diagnose or monitor conditions that cause pain, swelling, fever, and weight loss, such as inflammatory diseases[2].

### Indications of the Test

The ESR test is used to:

– Diagnose or monitor diseases that cause inflammation or cell damage[2]
– Check the patient’s response to treatment for certain conditions[2]
– Confirm a diagnosis of conditions that may cause elevated ESR levels[1]

### Patient Preparation/Instructions

There are no special steps needed to prepare for this test. A blood sample is usually drawn from a vein located on the inside of the elbow or the back of the hand[3]. The test may be performed alongside other tests, such as a complete blood count, comprehensive metabolic panel, and arthritis tests[4].

### Typical Reference Values

Reference values for ESR may vary depending on factors such as age, gender, health history, and other conditions[2]. An elevated ESR may indicate active inflammation in the body, while a lower-than-normal ESR may suggest conditions such as congestive heart failure, hyperviscosity, hypofibrinogenemia, leukemia, or low plasma protein levels due to liver or kidney disease[3].

### Turn Around Time

The turn around time for ESR testing may vary depending on the lab and the specific test used. It is essential to consult with your healthcare provider for accurate information on turn around times for ESR testing.

### Order This Test

To order the ESR test, click the ‘Order Test’ button and add it to your cart.

[1] From Mayo Clinic to your inbox https://www.mayoclinic.org/tests-procedures/sed-rate/about/pac-20384797
[2] Erythrocyte Sedimentation Rate – Health Encyclopedia https://www.urmc.rochester.edu/encyclopedia/content.aspx?contentid=erythrocyte_sedimentation_rate&contenttypeid=167
[3] ESR https://www.mountsinai.org/health-library/tests/esr
[4] ESR Blood Test (Erythrocyte Sedimentation Rate) – Testing.com https://www.testing.com/tests/erythrocyte-sedimentation-rate-esr/
[5] Erythrocyte Sedimentation Rate https://www.ncbi.nlm.nih.gov/books/NBK557485/

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