erythrocyte sedimentation rate. The distance red blood cells travel in one hour in a sample of blood as they settle to the bottom of a test tube. The sedimentation rate is increased in inflammation, infection, cancer, rheumatic diseases, and diseases of the blood and bone marrow. Also called sedimentation rate.

GoldBamboo

... Why get tested?
To detect and monitor the activity of inflammation as an aid in the diagnosis of the underlying cause

When to get tested?
When your doctor thinks that you might have a condition that causes inflammation and to help diagnose and follow the course of temporal arteritis or polymyalgia rheumatica

Sample required?
A blood sample drawn from a vein in the arm
...
Lab Tests Online - more...

ESR can stand for many things, including: electron spin resonance equivalen ...
Wikipedia - [full article]

Resources

  • ESR (Lab Tests Online)