ESR blood test
Erythrocyte sedimentation rate
In short
A typical adult ESR result is under 20 mm/h for women (under age 50), under 15 mm/h for men (under age 50), under 30 mm/h for women (age 50+) and under 20 mm/h for men (age 50+). A mild rise is common and can come from age, anemia or a recent infection. A very high ESR is looked at more closely, together with CRP and other tests. Always read your result against the range printed on your own report.
How fast red blood cells settle in a tube over an hour.
Blood stands in a tall tube, and the lab measures how far the red cells fall in an hour. Inflammation adds proteins that make red cells clump and sink faster. It is a general sign of inflammation, and it rises naturally with age.
Is my ESR high or low?
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Typical range
| For | Range | Unit |
|---|---|---|
| Female · under age 50 | under 20 | mm/h |
| Male · under age 50 | under 15 | mm/h |
| Female · age 50+ | under 30 | mm/h |
| Male · age 50+ | under 20 | mm/h |
Typical ranges for adults. Labs differ a little, so the range printed next to your result is the one to go by.
If your ESR is high
A mild rise is common and can come from age, anemia or a recent infection. A very high ESR is looked at more closely, together with CRP and other tests.
Common reasons
- Older age, and being female, both raise it naturally
- A recent infection, such as a cold or a urine infection
- Anemia, a low red blood cell count
- Pregnancy or kidney disease
- Arthritis or another inflammatory condition
- Less often: a serious infection, inflamed blood vessels or a blood cancer
What can throw it off
Anemia, pregnancy and older age all raise ESR even without inflammation.
Questions to take to your appointment
- 1Is this rise expected for my age?
- 2Should my CRP be checked too?
- 3Could anemia or a recent infection explain it?
Read together with
Doctors rarely read ESR alone. These usually sit next to it.
- CRPA protein the liver makes when there is inflammation.
- WBCThe total number of white blood cells, the body's infection fighters.
- HemoglobinThe protein in red blood cells that carries oxygen.
- GlobulinBlood proteins that include antibodies, the infection fighters.
- FibrinogenA liver-made protein that forms the mesh of a blood clot.
Quick answers
What is the ESR blood test?
ESR (Erythrocyte sedimentation rate): How fast red blood cells settle in a tube over an hour. Blood stands in a tall tube, and the lab measures how far the red cells fall in an hour. Inflammation adds proteins that make red cells clump and sink faster. It is a general sign of inflammation, and it rises naturally with age.
What is a normal ESR level?
For most adults, ESR is typically under 20 mm/h for women (under age 50), under 15 mm/h for men (under age 50), under 30 mm/h for women (age 50+) and under 20 mm/h for men (age 50+). Labs differ a little, so the range printed next to your result is the one to go by.
What does a high ESR mean?
A mild rise is common and can come from age, anemia or a recent infection. A very high ESR is looked at more closely, together with CRP and other tests. Common reasons include older age, and being female, both raise it naturally; a recent infection, such as a cold or a urine infection; anemia, a low red blood cell count; and pregnancy or kidney disease. A doctor reads it together with your other results and how you feel.
What can affect my ESR result?
Anemia, pregnancy and older age all raise ESR even without inflammation.
What should I ask my doctor about my ESR?
Questions worth taking to the appointment: Is this rise expected for my age? Should my CRP be checked too? Could anemia or a recent infection explain it?
What this page can’t do
It reads each number on its own.
Doctors read results together — ALT with AST, ferritin with hemoglobin, TSH with free T4. A pattern says more than any single flag.
It doesn't know you.
Your age, your medicines, how you feel and your last result all change what a number means.
It doesn't remember.
Close this page and your results are gone. That's on purpose: nothing was ever sent to us.
We also make Vita: Health Coach, an app for those parts. It reads your whole report with your medicines and history in mind, answers follow-up questions in plain words, and keeps your reports in one place — for you and for the people you look after.
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