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Sedimentation Rate (Sed Rate)

How It Feels

The blood sample is taken from a vein in your arm. An elastic band is wrapped around your upper arm. It may feel tight. You may feel nothing at all from the needle, or you may feel a quick sting or pinch.

Risks

Blood test

There is very little chance of a problem from having a blood sample taken from a vein.

  • You may get a small bruise at the puncture site. You can reduce the risk of bruising by keeping pressure on the site for several minutes after the needle is withdrawn.
  • In rare cases, the vein may become inflamed after the blood sample is taken. This condition is called phlebitis and is usually treated with a warm compress applied several times daily.
  • Continued bleeding can be a problem for people with bleeding disorders. Aspirin, warfarin (Coumadin), and other blood-thinning medicines can also make bleeding more likely. If you have bleeding or clotting problems, or if you take blood-thinning medicine, tell your health professional before your blood is drawn.

Results

The sedimentation rate (sed rate) blood test measures how quickly red blood cells (erythrocytes) settle in a test tube.

Normal

The normal values listed here—called a reference range—are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.

Results are usually available right away.

Sedimentation rate 1
Men

0–15 millimeters per hour (mm/hr), or 0–20 mm/hr for men older than 50

Women

0–20 mm/hr, or 0–30 mm/hr for women older than 50

Children

0–10 mm/hr

Newborns

0–2 mm/hr

High values

High sedimentation rates may be caused by:

Low values

Low values may be caused by:

WebMD Medical Reference from Healthwise

Last Updated: June 04, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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