ESR (Erythrocyte Sedimentation Rate)
A blood test that shows how quickly red blood cells settle at the bottom of a test tube. Faster settling can be a sign of inflammation in the body.
ESR (Erythrocyte Sedimentation Rate)
A blood test that shows how quickly red blood cells settle at the bottom of a test tube. Faster settling can be a sign of inflammation in the body.
Also known as
- ESR
- Sed rate
What it measures
- How quickly red blood cells settle in a tube of blood
Why a doctor may order it
It is used with other tests to help find and monitor conditions that cause inflammation, such as arthritis, vasculitis, infections and inflammatory bowel diseases. A doctor may ask for it if you have symptoms such as unexplained fever, headaches, joint stiffness, neck or shoulder pain, loss of appetite or unexplained weight loss.
What it helps evaluate
It can show that inflammation may be present, but it cannot tell which condition is causing it — other tests are needed.
Preparation
No special preparation is needed for this test.
Fasting
If other tests are done on the same blood sample, you may need to fast for several hours. Follow the instructions you are given.
Important considerations
- A raised ESR does not point to one specific condition.
- Doctors read it together with your symptoms, history and other test results.
Discuss results with your doctor
Talk to a doctor about your symptoms and about what your results mean — a single result is not a diagnosis. See a doctor promptly for severe or worsening symptoms.