Esr normal range: Learn about the erythrocyte sedimentation rate

Learn about the erythrocyte sedimentation rate ( ESR ) test, which measures the speed of red blood cells sinking in a tube. Find out the normal ESR levels by age and gender, the causes of high or low ESR , and the purpose and procedure of the test. Erythrocyte Sedimentation Rate Does this test have other names? ESR , sed rate What is this test? Erythrocyte sedimentation rate ( ESR ) is a blood test. It measures how quickly erythrocytes, or red blood cells, separate from a blood sample that has been treated so the blood will not clot. During this test, a small amount of your blood will be put in an upright tube. A lab specialist will measure the rate that your red blood cells settle toward the bottom of the tube after 1 hour. If you have a ... ESR test measures how fast red blood cells settle in a tube and indicates inflammation or infection in the body. Learn about the test procedure, side effects, and reference range for males and females.