An erythrocyte sedimentation rate (ESR) blood test measures how quickly red blood cells settle to the bottom of a test tube.
Doctors may order an ESR test to:
An ESR, also called a sedimentation (seh-duh-mun-TAY-shin) rate or sed rate, is how quickly red blood cells fall to the bottom of a test tube.
Erythrocytes (ih-RITH-ruh-sytes), or red blood cells, are a part of blood. Things like inflammation or infection can lead to red blood cells clumping together, which makes them heavier than normal. This makes the cells sink down faster in a test tube. The more quickly the red blood cells fall, the higher the ESR.
To help kids get ready for a blood test, find out if they need to fast (not eat or drink) or should stop taking medicines before the test. Explain what to expect during the test. If your child is nervous about it, work together on ways to stay calm. Deep breathing or even imagining being in a peaceful place that makes your child feel safe and calm can help.
A high ESR means that there’s likely inflammation or an infection. More tests may be needed to figure out the cause if it isn’t already known.
Your doctor will explain what the results of the ESR test mean for your child. What’s “normal” varies based on things like age and gender.
If you have questions about the ESR blood test, talk to your doctor.
Note: All information is for educational purposes only. For specific medical advice,
diagnoses, and treatment, consult your doctor.
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