ESR Test

What is this test?

Erythrocyte Sedimentation Rate is a blood test that measures the rate at which the red blood cells sediment at the bottom of a test tube in an hour.

Why this test is performed?

This test is performed to determine the presence of inflammation in the body. The inflammation can be due to infections, autoimmune disorders, cancers etc. However, this test does not specify the exact cause of inflammation. Your doctor may ask you to perform other tests along with this test to rule out the exact cause for your symptoms.

This test is performed to rule out the presence of inflammation in the body. Your doctor may ask to perform this test if you experience any signs and symptoms of inflammatory diseases. This includes fever, joint stiffness, headache, abnormal weight loss, loss of appetite, neck or shoulder pain, unusual abdominal pain, blood in stool, diarrhea etc.


Certain medications that cause low ESR test results are medicines used to treat seizures such as phenytoin, valproic acid, divalproex sodium; aspirin, prednisone, cortisone, phenothiazines. Medications that may cause high ESR test results are oral contraceptives, testosterone, estrogens, methyldopa, methadone, dextran, heroin etc.

If you have higher or lower than normal levels of ESR test results consult your doctor for further instructions. Based on the test results, your doctor may advise appropriate medical treatments, lifestyle modifications, or further diagnostic tests.

Also known as ESR Westergren Blood, Erythrocyte Sedimentation Rate Westergren, Sedimentation Test, Sed Rate Test.