Sedimentation rate or erythrocyte sedimentation rate (ESR) is a blood test offered to show the inflammation in your body. Inflammation is your body’s self-protecting response to get rid of harmful stimuli, however chronic inflammation is terrible for your body and can cause many diseases. This test can be done to diagnose or monitor inflammatory diseases such as arthritis. When your blood is drawn it is placed in a tube and your red blood cells slowly settle to the bottom of the tube. Inflammation often causes the blood cells to clump, thus making them denser causing them to sink to the bottom at a faster rate. The sedimentation rate test measures inflammation by how fast the red blood cells fall in one hour. The farther the blood cells have fallen, the greater the inflammation in your body. Your doctor might request you get a sedimentation rate test in order to monitor your arthritis, to assess unexplained fevers, or to diagnose conditions like Giant cell arteritis. Because this test does not pinpoint the cause of your inflammation, it is often accompanied with other blood tests. The sedimentation rate test is offered at www.HealthOneLabs.com for $34.95, there is no special preparation required for this test.