Description
The Erythrocyte Sedimentation Rate is a long-established, sensitive indicator of inflammation — a simple blood test that helps reveal hidden infection or autoimmune activity.
About the ESR (Sed Rate) Test
The ESR measures how quickly red blood cells settle at the bottom of a test tube over one hour. Faster settling reflects higher levels of inflammatory proteins in the blood. While it does not identify a specific disease, a raised ESR is a valuable clue that prompts further investigation, and it is widely used to monitor conditions such as arthritis, autoimmune disease and chronic infection over time.
Preparation and turnaround
A standard venous blood sample is taken and no fasting is required. The test takes only minutes to collect, with results typically available within one working day. Because the ESR is non-specific, it is best interpreted by a doctor alongside your symptoms and other markers such as CRP.
Frequently asked questions
What does a high ESR mean?
A raised ESR indicates inflammation somewhere in the body but does not pinpoint the cause. Your doctor will interpret it with your symptoms and, often, a CRP test.
How is ESR different from CRP?
Both detect inflammation. CRP rises and falls quickly, while ESR changes more slowly, so they are often used together for a fuller picture.
Is any preparation needed?
No fasting or special preparation is required for the ESR test.
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