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ESR (Erythrocyte Sedimentation Rate)

ESR blood test: why you get both ESR and CRP

Q: Why do I get both an ESR and a CRP?

Because they look at the same process at a different pace. CRP rises within hours and settles within days, while the ESR takes days to rise and weeks to come down. Together they show whether something is happening now or is already behind you, and one of the two on its own cannot make that difference visible.

Q: My ESR is high but my CRP is normal. What does that mean?

That is the most common combination and it is usually reassuring. It fits something already behind you, such as an infection a few weeks ago: CRP has settled while the ESR is still catching up. Your GP will look mainly at your symptoms here rather than only at the number.

Q: How high may my ESR be?

Your result carries a fixed limit: 15 mm/hour for men and 20 for women. A widely used rule of thumb also looks at your age: if you are a man, divide your age by two, and if you are a woman, add ten first. If you are older, the fixed number can flag you as raised unfairly.

Q: Can my ESR be high without inflammation?

Yes, and it happens more often than people think. Anaemia is the best known cause: with fewer red blood cells they settle faster, and the number rises. Pregnancy and excess weight also raise the value along an ordinary route. That is why your haemoglobin always belongs beside this result before you think about inflammation.

Q: How long before my ESR is normal again?

Count on weeks rather than days. Fibrinogen has a half-life of about four days and immunoglobulins stay in your blood far longer, so the value remains raised for a while after you already feel well again. A recheck only makes sense after several weeks.

Q: When should I see a GP about a high ESR?

At a value above roughly 100 mm/hour, and with any rise alongside symptoms that will not pass, such as unexplained fever, new stiffness in your shoulders or hips, or a new headache. These are not diagnoses, but they are reasons not to wait and see.

Your ESR value tells you how fast your red blood cells settle in an upright tube: after exactly one hour, the lab measures how much clear plasma sits at the top, in millimetres per hour. The ESR, in full the erythrocyte sedimentation rate, is an indirect measure of inflammation. If nothing unusual is happening, those cells drift down slowly, but during inflammation certain proteins in your blood rise that stick the cells together, and then they fall faster. So the test does not measure the inflammation itself but its effect on your blood, and that is why you usually get a second value alongside it.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Male Your group

mm/h

Normal < 15 High

Female Your group

mm/h

Normal < 20 High

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

ESR (Erythrocyte Sedimentation Rate): what this test measures

The test measures the speed at which your red blood cells settle over an hour, usually by the Westergren method: the tube stands upright and your result is the clear column at the top, in millimetres per hour. What happens is stacking. Your red blood cells normally push each other away slightly and float separately, but certain proteins in the blood remove that push, and the cells then slide together like a roll of coins that falls much faster.

Two proteins do nearly all the work: fibrinogen gets going in a few days, and immunoglobulins need weeks. Both are part of how your body reacts to inflammation and infection, and neither of them is the inflammation itself.

The limits the lab prints on your result are upper limits: 15 mm/hour for men and 20 mm/hour for women. There is also a widely used rule of thumb that accounts for your age: for men your age divided by two, for women your age plus ten, divided by two. Those two numbers drift apart as you get older. If you are a woman of 70, the rule of thumb gives 40 while your result still prints 20, and you then get flagged as raised at a value that is entirely ordinary for your age. Every lab also applies its own limits, so read the numbers on your own result.

ESR (Erythrocyte Sedimentation Rate): why this value matters

An ESR value only tells you something beside your CRP, which is why you almost always get it together with C-reactive protein (CRP). That is no duplicate measurement and no oversight: the two look at the same process, but at a different pace. CRP is fast and starts rising within hours to settle again within days; the ESR is slow, because fibrinogen needs days to build and immunoglobulins need weeks.

That difference is what makes the pair useful, because two values on two timescales tell you whether something is happening now or is already behind you. If both are normal, there is no current sign of inflammation. If only CRP is high, something is recent and the ESR simply has not caught up. If both are high, something has been running for a while. And if only the ESR is high, it usually concerns something already past.

That last combination causes the most unnecessary worry. A raised ESR with a normal CRP is often the aftermath of an infection weeks ago, because fibrinogen has a half-life of about four days and immunoglobulins linger far longer.

There are also situations where the ESR is the more useful of the two, such as polymyalgia rheumatica and giant cell arteritis, and in lupus the CRP sometimes stays normal during a flare while the ESR rises. Neither value says where something is or what it is; your symptoms and your GP's judgement are what give them meaning.

ESR (Erythrocyte Sedimentation Rate): how the blood test works

Referral: No GP referral needed. After the order we arrange the referral through ZorgDomein, within one business day; orders after 17:00 or at the weekend start on the next business day. ZorgDomein emails a barcode, and that barcode is what the draw site needs.
The draw: A blood draw from a vein in the arm, at a partner laboratory's draw site. No home kit, no finger prick.
Which test: on its own €9,-
Where: 650+ draw sites run by independent laboratories across the Netherlands. Draw sites

ESR (Erythrocyte Sedimentation Rate): when is testing worthwhile?

Your GP usually orders this value for complaints that have lasted a while: fever without a clear cause, joint pain that persists, or stiffness that will not ease. It also belongs to following an inflammatory condition that is already known, and then it is not about one number but about the line across several measurements.

The draw itself affects the result more than you would expect. The tube needs to stand upright at room temperature and be processed within a few hours, because if it tilts, the result reads too high. Check that before an abnormal number alarms you, because an error in the collection is no medical problem, even though on paper it looks exactly the same.

And be patient with the recheck. This value moves slowly, so a new measurement after a week says little and after a few weeks a great deal more.

ESR (Erythrocyte Sedimentation Rate): symptoms of a high or low value

Low Levels

A low ESR is almost always simply fine. There is no lower limit you can drop below and need to act on, and if your result reads 2 or 3 mm/hour, that is good.

There are a few situations where a low number means something. Anything that changes the count or shape of your red blood cells slows the settling: in polycythaemia you have too many, in sickle cell disease and spherocytosis they have a different shape, and a sharply raised white cell count works the same way.

And then there is a catch. In exactly those situations a tidy result can hide genuine inflammation, so the number looks reassuring while something is in fact going on. That is precisely why your GP never assesses this value on its own.

High Levels

A raised result fits a great many things at once, and that is what makes it hard to read. Inflammation and infection raise it, an autoimmune disease does too, and pregnancy and excess weight raise it with nothing wrong.

The cause most often overlooked is anaemia. With fewer red blood cells in the tube, they settle faster, and your result then rises while there is no inflammation anywhere. That is why your haemoglobin belongs next to it, because without that value you cannot tell whether you are looking at inflammation or at a shortfall.

A mildly raised result is rarely a reason for concern on its own, and shortly after flu or an infection it is even expected. Above roughly 100 mm/hour things are different: a value like that you discuss with your GP, because several things can produce such a result, and working that out is a doctor's job.

ESR (Erythrocyte Sedimentation Rate): what to do about an abnormal value

Male

If Low

Low ESR is normal and indicates no active inflammation.

If High

Elevated ESR indicates inflammation. Consider further evaluation for the underlying cause.

Female

If Low

Low ESR is normal and indicates no active inflammation.

If High

Elevated ESR indicates inflammation. Consider further evaluation for the underlying cause.

ESR (Erythrocyte Sedimentation Rate): lifestyle and this value

You cannot bring this number down directly, and you do not need to. The ESR is a consequence of something else, and tackling the consequence without knowing the cause gets you nowhere. The most useful thing is finding out where it comes from: if it stays raised, that is worth a conversation with your GP, and no supplement and no diet will solve this for you.

Two things are worth doing. Have your haemoglobin and iron status measured alongside it, because anaemia lifts this number without inflammation, and give it time, because after an infection this value only settles over weeks.

The ordinary things do help in the long run. Not smoking, sleeping enough, staying active and a healthy weight all lower low-grade inflammation, but do not expect a quick change in this number from them. If you have had symptoms for weeks, discuss the result with your GP, because that is what this value is for.

ESR (Erythrocyte Sedimentation Rate): frequently asked questions

Why do I get both an ESR and a CRP?

Because they look at the same process at a different pace. CRP rises within hours and settles within days, while the ESR takes days to rise and weeks to come down. Together they show whether something is happening now or is already behind you, and one of the two on its own cannot make that difference visible.

My ESR is high but my CRP is normal. What does that mean?

That is the most common combination and it is usually reassuring. It fits something already behind you, such as an infection a few weeks ago: CRP has settled while the ESR is still catching up. Your GP will look mainly at your symptoms here rather than only at the number.

How high may my ESR be?

Your result carries a fixed limit: 15 mm/hour for men and 20 for women. A widely used rule of thumb also looks at your age: if you are a man, divide your age by two, and if you are a woman, add ten first. If you are older, the fixed number can flag you as raised unfairly.

Can my ESR be high without inflammation?

Yes, and it happens more often than people think. Anaemia is the best known cause: with fewer red blood cells they settle faster, and the number rises. Pregnancy and excess weight also raise the value along an ordinary route. That is why your haemoglobin always belongs beside this result before you think about inflammation.

How long before my ESR is normal again?

Count on weeks rather than days. Fibrinogen has a half-life of about four days and immunoglobulins stay in your blood far longer, so the value remains raised for a while after you already feel well again. A recheck only makes sense after several weeks.

When should I see a GP about a high ESR?

At a value above roughly 100 mm/hour, and with any rise alongside symptoms that will not pass, such as unexplained fever, new stiffness in your shoulders or hips, or a new headache. These are not diagnoses, but they are reasons not to wait and see.

Tests with related values

These panels measure values from the same category as this marker.

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Complete Blood Count (CBC) ALP (Alkaline Phosphatase) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) Albumin Total Protein Bilirubin (Total) ApoB (Apolipoprotein B) Total Cholesterol LDL Cholesterol HDL Cholesterol Triglycerides Lipoprotein(a) Urea (BUN) Creatinine eGFR (Estimated Glomerular Filtration Rate) Calcium Bicarbonate Chloride Sodium Potassium Magnesium Cortisol DHEA-S Estradiol (E2) FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) SHBG (Sex Hormone Binding Globulin) Total Testosterone Free Testosterone TSH (Thyroid Stimulating Hormone) Glucose (Fasting) HbA1c (Glycated Hemoglobin) Insulin (Fasting) HOMA-IR CRP (C-Reactive Protein) Homocysteine Ferritin Iron (Serum) Transferrin Transferrin Saturation Vitamin D (25-OH) Leptin Zinc Selenium Iodine Copper Free T3 (Triiodothyronine) Free T4 (Thyroxine) GGT (Gamma-Glutamyl Transferase) Bilirubin (Direct) Bilirubin (Indirect) Cholesterol/HDL Ratio Non-HDL Cholesterol LDL/HDL Ratio

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A 46-biomarker heart health panel inspired by the WHOOP Heart Health Panel — an advanced look at cholesterol, lipoproteins, inflammation and kidney function.

Complete Blood Count (CBC) ALP (Alkaline Phosphatase) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) Albumin Total Protein Bilirubin (Total) ApoB (Apolipoprotein B) Total Cholesterol LDL Cholesterol HDL Cholesterol Triglycerides Lipoprotein(a) Urea (BUN) Creatinine eGFR (Estimated Glomerular Filtration Rate) Calcium Bicarbonate Chloride Sodium Potassium Magnesium Cortisol DHEA-S Estradiol (E2) FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) SHBG (Sex Hormone Binding Globulin) Total Testosterone Free Testosterone TSH (Thyroid Stimulating Hormone) Glucose (Fasting) HbA1c (Glycated Hemoglobin) Insulin (Fasting) HOMA-IR CRP (C-Reactive Protein) Homocysteine Ferritin Iron (Serum) Transferrin Transferrin Saturation Vitamin D (25-OH) Cystatin C Uric Acid Bilirubin (Direct) Bilirubin (Indirect) Cholesterol/HDL Ratio Non-HDL Cholesterol LDL/HDL Ratio

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