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Single Biomarker

Erythrocyte Sedimentation Rate (ESR)

Inflammation Marker (ESR)

ESR measures how quickly red blood cells settle in a tube over one hour. A faster rate suggests inflammation in the body from infections, autoimmune diseases, or cancers. No fasting required.

BLOOD24 HOURSNO FASTING
AEDAED50
  • Free home collection
  • Physician-reviewed report

24 Hours

Turnaround

Blood

Sample

About This Test

What the Erythrocyte Sedimentation Rate (ESR) test tells you

The erythrocyte sedimentation rate is one of the oldest laboratory tests still in routine use, and its principle is simple. A sample of blood is placed in a narrow vertical column and left undisturbed, and the laboratory records how far the red cells settle away from the plasma over a fixed interval. When inflammation is present, the liver releases proteins into the blood, fibrinogen chief among them, and these proteins reduce the natural repulsion between red cells so that the cells stack together. Stacked cells are heavier than single ones and sink faster, so the distance they fall becomes an indirect measure of how much inflammatory protein is circulating.

The test's great strength and its great weakness are the same thing: it is entirely non-specific. A raised rate says that an inflammatory process is likely somewhere in the body, but it says nothing whatever about where that process is, what is causing it, or how serious it is. Infection, autoimmune disease, tissue injury, some cancers and several conditions involving no inflammation at all can produce the same picture. It is therefore never used alone to make a decision; it is used to support a suspicion, to help decide whether further investigation is warranted, or to follow something already diagnosed.

It also moves slowly. Unlike markers that respond within hours, the rate climbs over days and falls back over weeks, which makes it poorly suited to tracking a rapidly changing illness but well suited to monitoring a long-running one such as rheumatoid arthritis or polymyalgia rheumatica. That sluggishness is why doctors often order it alongside C-reactive protein, which reacts far more quickly, so that the two together give a sense of both the immediate and the sustained picture. Your doctor will read the result against your age, sex and general condition rather than in isolation.

Sample type
Blood
Measured in
mm/hr
Turnaround
24 Hours
Fasting
Not required
Best for
All ages
Why Get Tested?

Useful for detecting and monitoring inflammatory conditions, especially when combined with CRP. Also used to monitor response to treatment in autoimmune diseases.

  • Detecting hidden inflammation

    It offers a simple way to check whether an inflammatory process may be present when symptoms are vague or general.

  • Monitoring chronic disease

    Because it changes slowly, it suits the following of inflammatory conditions and their response to treatment over months.

  • Supporting suspected arteritis

    In an older adult with new headache and scalp tenderness, a strikingly raised rate strengthens the case for urgent assessment.

  • Complementing CRP

    CRP reacts within hours and this test over days, so ordering both gives a fuller sense of the time course.

When This Test Is Ordered

Reasons your doctor may request the Erythrocyte Sedimentation Rate (ESR) test

Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.

  • Unexplained fever & fatigue

    • You have unexplained fever, weight loss or persistent fatigue that needs investigating.

  • Suspected temporal arteritis or polymyalgia

    • New headache, scalp tenderness or jaw discomfort in an older adult raises the possibility of temporal arteritis.
    • You have pain and stiffness across the shoulders and hips suggestive of polymyalgia rheumatica.

  • Following inflammation over time

    • A diagnosed inflammatory or autoimmune condition is being followed over time.
    • Your doctor wants a slower-moving companion to CRP while assessing an infection.
Preparation
The short version
No prep needed.
  • Blood
  • Free home collection
  • No fasting
  • Results in 24 Hours
  1. 1
    Book any time

    No fasting window: pick any slot that suits you, online or on WhatsApp.

  2. 2
    We come to you

    A DHA-licensed nurse collects your sample at home or in the office: free home collection.

  3. 3
    Results in 24 Hours

    A physician-reviewed, easy-to-read report lands securely by WhatsApp and email.

Prep note
Physician reviewed

No fasting is needed and you can take your usual medicines.

Timing matters more than diet for this test: the sample must reach the laboratory promptly and be analysed within a limited window, because blood that stands too long or is kept warm settles differently and gives an unreliable rate. Tell the team if you are pregnant, currently menstruating, known to be anaemic, or taking anti-inflammatory or steroid medicines, since each of these shifts the result independently of the condition being investigated.

If the test is being repeated to follow progress, using the same laboratory each time makes the comparison more meaningful.

Understanding Your Results

A result in the Normal band, 0 to 20 mm/hr, means no significant inflammation was signalled on the day of the test. It does not exclude serious disease, because the rate climbs over days rather than hours. A result in the High band, 21 to 100 mm/hr, is a non-specific sign that an inflammatory process is likely somewhere: infection, rheumatoid disease or lupus, temporal arteritis, some cancers, chronic kidney disease or long-standing tissue injury. Several things move the rate with no inflammation involved. Age, female sex, pregnancy, anaemia and obesity raise it, while a high red cell count, abnormally shaped red cells and very high white cell counts slow the settling and lower it. Because it falls back over weeks, it suits a long-running condition better than a fast-moving one, and is often paired with CRP. Your doctor reads it against your age, sex, symptoms and history.

SmartReport
20
Healthy zone10mm/hrNormal
Reference ranges · mm/hr
Normal
Normal: no significant inflammation indicated.
0–20
High
Elevated: a non-specific sign of inflammation.
21–100

Ranges are a guide: your physician interprets your result alongside your symptoms and history.

Reading a High or Low Result

  • What a higher result can point to

    • Infection, whether acute or long-standing such as tuberculosis or a deep abscess.
    • Autoimmune and rheumatic disease, including rheumatoid arthritis and lupus.
    • Temporal arteritis and polymyalgia rheumatica, in which the rate is often strikingly raised.
    • Anaemia and pregnancy, which speed settling for reasons that have nothing to do with inflammation.
    • Some cancers, particularly those involving the bone marrow and plasma cells.
    • Chronic kidney disease and long-standing tissue injury.

  • What a lower result can point to

    • A high red cell count, as in polycythaemia, which crowds the column and slows settling.
    • Abnormally shaped red cells such as sickle cells or spherocytes, which do not stack neatly.
    • Very high white cell counts, which interfere with the settling column.
    • Low fibrinogen, sometimes seen in advanced liver disease.

These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.

Limitations & Safety

What this test cannot tell you

  • It is entirely non-specific: it suggests inflammation is present but says nothing about where it is, what is causing it, or how serious it is.
  • It responds slowly in both directions, rising over days and settling over weeks, so it lags behind the illness it reflects.
  • Age, female sex, pregnancy, anaemia and obesity all shift the rate independently of any disease, so the result is read against the person rather than as an absolute.
  • A low result carries little clinical meaning on its own and does not usually require explanation.

Risks of the blood draw

  • Mild bruising or brief soreness where the needle went in.
  • Occasional lightheadedness, which settles after a few minutes of rest.
  • Bleeding or infection at the site, which is rare with sterile single-use equipment.
Key Points
  • 1The test measures how quickly red cells settle out of plasma in an undisturbed vertical column.
  • 2Inflammatory proteins make red cells stack together, and stacked cells sink faster.
  • 3Its slow response makes it better for following chronic disease than for tracking an acute illness.
  • 4A normal result does not exclude serious disease, and a raised one does not confirm any particular diagnosis.
  • 5It is often paired with CRP because the two markers respond on very different timescales.
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Frequently Asked Questions

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The laboratory measures the distance red cells fall away from the plasma in an upright column of blood over a set interval. It is an indirect way of detecting the inflammatory proteins that make red cells clump together and sink faster.