ESR
Understanding ESR: Tests, Preparation, Risks, and More
ESR, which stands for erythrocyte sedimentation rate, is a blood test used to detect inflammation in the body. In this article, we will discuss what the ESR test measures, how it is performed, the possible risks and results of the test, and when an ESR test might be ordered.
What does an ESR test measure?
The ESR test measures the rate at which red blood cells (erythrocytes) settle in a test tube. Inflamed or infected tissues in the body release proteins and other substances that make the red blood cells clump, causing them to settle faster than normal. The rate of these cell clumping and settling is measured as the erythrocyte sedimentation rate, or ESR.
How is an ESR test performed?
During the ESR test, a blood sample is taken from the patient and placed in a special tube. The tube is then placed in an upright position for an hour, during which time the red blood cells will settle to the bottom of the tube. At the end of this hour, the height of the red blood cells is measured. Normally, red blood cells will settle very slowly and the height will remain the same. However, if the red blood cells settle quickly, it is a sign of inflammation or infection in the body.
What are the risks and results of an ESR?
The ESR test is generally considered to be a safe test with no significant risks. Generally, it is used as a screening tool and is not used to diagnose a specific condition. The results of an ESR test are not black and white; instead, the measured rate is compared to normal levels and increases or decreases in the rate are considered to be indicative of changes in the level of inflammation. The results of an ESR test can also be used in combination with other tests to narrow down a diagnosis.
When is an ESR ordered?
An ESR test may be ordered when a doctor suspects that inflammation or infection may be present in the body. It may be used to help diagnose a variety of conditions, such as infection, autoimmune disorders, some types of cancer, and rheumatoid arthritis. It is typically used in combination with other tests, such as a complete blood count, to help narrow down a diagnosis.
Types of ESR
- Westergren ESR Test – This is the most common type of ESR test, and it is the type mentioned above in which a blood sample is placed in a test tube and left for one hour.
- Automated ESR – This type of ESR uses a machine to measure the rate at which red blood cells settle. It is faster than the Westergren method, but it is also less reliable.
Conclusion
The ESR test is a blood test used to measure the rate at which red blood cells settle. This test can help to detect inflammation or infection in the body, and it is typically used in combination with other tests to narrow down a diagnosis. The test is considered to be safe and has few risks. There are two types of ESR tests, the Westergren method and the automated method, and either may be ordered when a doctor suspects inflammation or infection.