Erythrocyte Sedimentation Rate (ESR)
Test code: HMT0029
- Sample
- Blood
- Preparation
- Fasting preferred
- Report
- Within 3 Hours
- Processed
- Mon to Sun, by 06:00 PM
About this test
The ESR (Erythrocyte Sedimentation Rate) test measures how quickly red blood cells settle at the bottom of a test tube. A faster rate suggests inflammation somewhere in the body. It is a simple, general test that helps doctors detect and monitor infections, arthritis and other inflammatory conditions.
Preparation & sample
Overnight fasting is preferred. You can drink plain water.
What does this test measure?
It measures how many millimetres red blood cells fall in a tube of blood in one hour (mm/hr). When there is inflammation, certain proteins in the blood make red cells clump together and settle faster, giving a higher ESR.
When should you get this test?
- Long-lasting fever, unexplained weight loss or night sweats
- Joint pain, stiffness or swelling
- Muscle pain and stiffness, especially in older adults
- To help monitor conditions such as rheumatoid arthritis or tuberculosis during treatment
- Often done together with a CBC as part of a check-up
Understanding your results
- A high ESR means there is likely inflammation, but it does not show where it is or what is causing it. Infections, autoimmune diseases, anemia, kidney disease and some cancers can all raise it.
- ESR is naturally a little higher in women, older adults and during pregnancy, so your report shows a range based on age and sex.
- A normal ESR does not rule out every illness.
Because ESR is non-specific, doctors use it together with your symptoms and other tests such as CRP.
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