ESR (Erythrocyte Sedimentation Rate)
One of the oldest laboratory tests — simple, cheap, and still useful in select situations, though in most cases it's been replaced by the faster and more specific CRP.
Number of studies
1
Safety
Requires caution
Time to effects
Not applicable — ESR is a diagnostic test, not an intervention.
Who it's for
Table of contents
TL;DR
One of the oldest laboratory tests — simple, cheap, and still useful in select situations, though in most cases it's been replaced by the faster and more specific CRP.
- →Remains a valuable, well-validated tool for diagnosing and monitoring giant cell arteritis and polymyalgia rheumatica
- →A simple, cheap, and widely available test even in basic laboratories
- →An extremely elevated result (above roughly 100 mm/h) correlates strongly with a serious underlying condition, most often infection, autoimmune disease, or cancer
| Test type | Measures how fast red blood cells settle in a tube over one hour, a nonspecific inflammation marker |
|---|---|
| Level of evidence | Strong for select uses (e.g., monitoring giant cell arteritis), limited as a general screening test |
| Target group | People with suspected rheumatic disease, chronic inflammation, or unexplained general symptoms |
| Key parameter | ESR result in mm/h, strongly dependent on age and sex — reference ranges rise with age |
| Preparation | Doesn't require fasting; the result depends on sample quality and how quickly it reaches the lab |
| Status | A historical test, largely supplanted by CRP, but still useful for select rheumatologic indications |
Understand
Overview
The erythrocyte sedimentation rate (ESR), known in Poland as odczyn Biernackiego (OB) after the Polish physician who described it in the early 20th century, measures how far red blood cells settle in a vertical tube of anticoagulated blood over one hour — the faster they settle, the higher the ESR, which indirectly signals a more active inflammatory process in the body.
ESR is a nonspecific test — an elevated result doesn't point to a particular disease, only signals the presence of inflammation, infection, an autoimmune condition, or, less often, cancer. In recent decades, ESR has largely been supplanted by C-reactive protein (CRP) as the first-choice inflammation marker, since CRP responds faster (within hours rather than days) and is less prone to distortion by factors unrelated to inflammation, such as age or anemia.
Who can genuinely benefit from this? ESR retains particular clinical value in the diagnosis and monitoring of select rheumatic conditions, especially giant cell arteritis (temporal arteritis) and polymyalgia rheumatica, where extremely elevated values (often above 100 mm/h) carry real diagnostic significance. Outside these indications, ESR is still sometimes ordered as a cheap, general screening test, though its value in that role is limited.
Mechanism of action
How fast red blood cells settle depends mainly on the concentration of plasma proteins, especially fibrinogen and immunoglobulins — acute-phase proteins whose liver production rises under the influence of pro-inflammatory cytokines (mainly interleukin-6) released in response to infection, tissue injury, or an autoimmune process. Elevated levels of these proteins neutralize the negative surface charge of red blood cells that, under normal conditions, causes them to repel one another — red blood cells begin clumping into so-called rouleaux, which settle faster than individual cells, raising the ESR result.
Because the change in fibrinogen and other acute-phase proteins in response to inflammation unfolds gradually, over several days, ESR responds more slowly than CRP both to the onset and to the resolution of an inflammatory process — which can be misleading with a rapidly changing clinical picture. On top of that, factors unrelated to inflammation itself affect the ESR result: anemia and macrocytosis raise it (fewer, larger red blood cells favor rouleaux formation), while polycythemia, microcytosis, and extreme leukocytosis lower it, further limiting the test's specificity.
Rise in acute-phase proteins
Pro-inflammatory cytokines (mainly IL-6) drive the liver to produce more fibrinogen and immunoglobulins.
Neutralization of red blood cell charge
Elevated levels of these proteins weaken the natural repulsion between red blood cells, favoring clumping.
Rouleaux formation and faster settling
Red blood cells clumped into rouleaux settle faster than individual cells, raising the ESR result.
Evidence: strong — based on 1 study in this database.
Benefits
Common myths
MythA normal ESR result rules out a significant inflammatory or malignant condition.
FactAs a standalone screening test, ESR has limited sensitivity — a normal result doesn't rule out serious disease, especially early on, before acute-phase protein levels have had time to rise.
MythESR and CRP measure exactly the same thing and can be used interchangeably.
FactBoth are nonspecific inflammation markers, but CRP responds faster (hours) and is less affected by factors unrelated to inflammation than ESR, which responds more slowly (days) and also depends on age, sex, or anemia.
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Practice
Frequently asked questions
Both are nonspecific markers of inflammation, but CRP responds much faster (within hours) and is less affected by factors unrelated to inflammation, while ESR responds more slowly (within days) and depends more strongly on age, sex, or anemia.
Values above roughly 100 mm/h are considered extremely elevated and correlate strongly with a serious underlying condition — most often infection, autoimmune disease (e.g., giant cell arteritis), or cancer, though final interpretation always requires clinical assessment.
Its value as a general screening test in people without symptoms is limited and not supported by the literature — but it retains real value for specific indications, especially diagnosing and monitoring giant cell arteritis and polymyalgia rheumatica.
What to combine with
Good combinations
CRP and hs-CRP — CRP responds faster than ESR and helps confirm or refine the picture of how inflammation is changing over time
Complete Blood Count (CBC) — A complete blood count helps rule out anemia or red blood cell abnormalities that can artificially raise or lower the ESR result
Safety
Side effects & contraindications
Possible side effects
Contraindications
No significant contraindications at typical doses.
Interactions
Anemia and macrocytosis raise ESR independent of any actual inflammation
Pregnancy, obesity, older age, and being female physiologically raise ESR — reference ranges increase with age and are higher in women
Polycythemia, extreme leukocytosis, and certain red blood cell shape disorders (e.g., spherocytosis, sickle cell anemia) can artificially lower the result
Is it worth taking?
Who it's for
- People with suspected giant cell arteritis or polymyalgia rheumatica, where ESR has well-established diagnostic and monitoring value
- People with unexplained general symptoms (chronic fatigue, low-grade fevers, weight loss) as part of a broader differential workup
Not for
- No significant contraindications at typical doses.
Evidence
Worth knowing
ESR reference ranges rise with age and are typically higher in women than men — a rough rule of thumb is age/2 for men and (age+10)/2 for women.
The test was described in the early 20th century by Polish physician Edmund Biernacki, hence its Polish name odczyn Biernackiego, while English-language literature uses the term ESR.
Studies
ESR remains useful in specific diagnosis of giant cell arteritis, polymyalgia rheumatica, and probably rheumatoid arthritis, and in monitoring these conditions, while the literature does not support its usefulness as a general screening test for detecting serious disease.
Brigden ML, American Family Physician, 1999
Clinical utility of the erythrocyte sedimentation rate
Strong evidenceBrigden ML · American Family Physician · 1999
A classic clinical review examining the real diagnostic value of ESR, including the indications where it retains usefulness and the limitations of its use as a screening test.
View studySources & bibliography
The PubMed identifiers in this knowledge base were checked against NCBI records (October 2026). If you spot an error in a source, please let us know via the contact form.
Compare with similar entries
About the authors of this entry
Author
Redakcja VitMode — Badania i biomarkeryEditorial team
VitMode Editorial — Lab Tests and Biomarkers is the VitMode editorial team responsible for: laboratory tests, interpreting results and ageing biomarkers. The team has no individual bylines — texts are prepared by VitMode editors from primary sources (clinical trials, meta-analyses, guidelines). Every cited PubMed paper is automatically checked for a matching identifier, title and publication year. The content is educational and does not replace medical advice. Factual errors can be reported in a comment under the post or through the contact form; corrections are made by the editorial team.
272 publications on this site
Editorial review
Redakcja VitMode — Hormony i endokrynologiaEditorial team
VitMode Editorial — Hormones and Endocrinology is the VitMode editorial team responsible for: hormones, testosterone therapy, the thyroid and metabolism. The team has no individual bylines — texts are prepared by VitMode editors from primary sources (clinical trials, meta-analyses, guidelines). Every cited PubMed paper is automatically checked for a matching identifier, title and publication year. The content is educational and does not replace medical advice. Factual errors can be reported in a comment under the post or through the contact form; corrections are made by the editorial team.
328 publications on this site
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