Erythrocyte Sedimentation Rate (ESR)

Included Tests

Erythrocyte Sedimentation Rate (ESR) measures the rate at which red blood cells settle over a fixed period. It helps doctors identify inflammation in the body and monitor inflammatory or autoimmune conditions.

Details

Know More About This Test

The Erythrocyte Sedimentation Rate (ESR) test is a simple blood test that helps detect inflammation in the body. It measures how quickly red blood cells settle at the bottom of a test tube within a fixed period. When inflammation is present, certain proteins in the blood can cause the red blood cells to settle faster than usual.

ESR is a non-specific marker. This means it does not diagnose a single disease on its own, but it helps doctors look for ongoing inflammation, infection, or autoimmune activity and monitor how a condition is changing over time.

Why Is This Test Recommended?

This test may be recommended to:

check for inflammation in the body

support evaluation of fever of unknown cause

help investigate joint pain, body pain, or muscle stiffness

monitor autoimmune conditions such as rheumatoid arthritis or lupus

follow response to treatment in inflammatory or infectious conditions

What Do the Results Indicate?

A high ESR may suggest inflammation, infection, autoimmune disease, or other chronic medical conditions

A normal ESR may mean there is no significant inflammatory activity at the time of testing

ESR should always be interpreted together with symptoms, medical history, and other tests because it is not disease-specific

How Is the Test Performed and Prepared For?

A blood sample is collected from a vein in the arm. No fasting is usually required. It is a quick and routine blood test.

Frequently Asked Questions (FAQs)

Is ESR a disease-specific test?

No. ESR is a general inflammation marker and does not point to one specific disease.

Can ESR increase in infections?

Yes. ESR may rise in many infections because inflammation affects how red blood cells settle.

Do I need fasting for ESR?

Usually no. No special preparation is generally required unless your doctor combines it with other tests.

Can ESR be used to monitor treatment?

Yes. Doctors often use ESR to follow inflammatory or autoimmune conditions over time.

Can a normal ESR still occur with illness?

Yes. A normal ESR does not completely rule out disease, so it should always be read along with symptoms and other reports.