Erythrocyte sedimentation rate (ESR) test is a blood test which checks if you have any inflammation. It can also track the progress of specific diseases. It is often called the “sickness index”. Read on to find out how ESR works, what can impact ESR levels in your body, and how it all relates to your health.

What is Erythrocyte Sedimentation Rate (Sed Rate)?

Erythrocyte sedimentation rate (ESR) was discovered in 1987 [R, R].

The ESR is the rate at which red blood cells (erythrocytes) sink to the bottom (sedimentation) of a tube in one hour [R, R].

The main factors affecting ESR are hematocrit (percentage of red blood cells in your blood) and blood proteins, such as fibrinogen [R].

The ESR test has many functions.

ESR Blood Test

Erythrocyte sedimentation rate (ESR) test or “sed rate test”, is a blood test which checks for inflammation. It measures the distance in millimeters that red blood cells fall in one hour (mm/hr). [R, R].

There are a few ways that this is measured, such as the Westergren method, Wintrobe Method, MicroESR, and automated methods [R, R, R]

Westergren Method

The Westergren method is considered the gold standard in measuring ESR [R].

The doctor mixes the blood sample with sodium citrate (4:1). Then he puts the mix into a Westergren-Katz tube (2.5 mm diameter) until the 200 mm mark.

Next, he sets the tube vertically, at room temperature (18-25 °C), for one hour.

At the end of the hour, the doctor measures how far the red blood cells have settled. This distance is ESR.  

In the modified Westergren method, the doctor uses edetic acid instead of sodium citrate [R, R, R].

Other methods:

The Wintrobe method is less sensitive than the Westergren method and the maximal values may be misleading [R, R].

The micro ESR method is quick (20 min) and popular for babies, as the test requires very little blood. It is also useful for diagnosing neonatal sepsis  [R, R, R].

Automated methods are faster, easy to use, and could be better predictors for autoimmune diseases. Yet, their sensitivity to technical procedures (blood mixing, tube sizes, etc) could influence the test results [R, R, R, R, R, R, R, R].

What Can The ESR Test Reveal?

1) Checks For Inflammation

The ESR test checks if you have an inflammation [R].

In inflammation, certain proteins will appear in the blood, such as fibrinogen. These proteins cause red blood cells to cling together and form clumps. This makes them heavier, so they fall faster, which increases the ESR [R, R, R].

Therefore, high ESR shows inflammation. The higher the ESR level, the higher the inflammation [R, R, R].  

But, the ESR test is not very sensitive (so it can’t pick up all inflammation) nor specific, so it can not diagnose specific diseases [R].

2) Screen for Specific Diseases

The ESR test could help with the diagnosis of certain diseases:

  • Polymyalgia rheumatica (inflammatory disease which causes muscle pain and stiffness)  [R, R, R]
  • Giant cell arteritis (inflammation of blood vessels) [R,  R, R, R, R]
  • Cancer [R, R]
  • Bone infections [R, R, R].
  • Subacute thyroiditis (inflammation of the thyroid) [R, R, R]
  • Ulcerative colitis [R]

3) Tracks Progression of Specific Conditions

The ESR test cannot diagnose diseases, but it can track the progress of specific conditions [R]:

  • Heart disease [R, R, R]
  • Cancer [R, R, R]
  • Rheumatoid arthritis  R, R, R, R]
  • Systemic lupus erythematosus (SLE) [R, R, R]
  • Sickle-cell disease [R, R, R]

4) Suggests Serious Conditions

ESR levels higher than 100 mm/hr could suggest a serious disease, such as infection, heart disease, or cancer [R, R, R, R].

ESR levels higher than normal may predict cancer or cancer progression, like metastasis [R, R, R, R, R].

When to Get a Sed Rate Test

Your doctor may order an ESR test if you have the following symptoms [R]:

  • Headache
  • Fever
  • Joint or shoulder pain
  • Abnormal weight loss
  • Anemia

Normal ESR Levels

Age Men Women
Younger than 50 0-15 mm 0-20 mm
Older than 50 0-20 mm 0-30 mm

Children should have an ESR lower than 10mm [R]

A low ESR is normal and does not cause any symptoms [R].

Factors That Increase ESR Levels

  • Inflammation, infection, or malignant diseases can increase ESR rates [R, R, R, R, R, R].
  • Women tend to have higher ESR rates [R, R, R, R].
  • Old age  R, R, R, R, R]
  • Anemia; reduced hematocrit increases ESR levels [R, R, R, R].
  • Macrocytosis (large red blood cells) [R, R]
  • Polycythemia (increased production of red blood cells) [R, R, R, R, R]
  • Increased fibrinogen levels [R, R]
  • Pregnancy [R, R]
  • Diabetes [R, R, R]
  • kidney failure [R]
  • Chronic heart failure [R]
  • Obesity [R, R].
  • Hyperlipidemia (high concentrations of fats in the blood) [R]
  • Heart disease [R, R, R]
  • Polymyalgia rheumatica (an inflammatory disorder where there is muscle pain around the shoulders and hips) [R, R, R]
  • Subacute thyroiditis [R]
  • Alcoholic liver disease, which can cause decreased albumin production, and thus increase ESR [R]
  • Crohn’s disease and ulcerative colitis [R, R]
  • Kidney failure [R]
  • Temporal/giant cell arteritis (inflammation in blood cells around the scalp) [R, R]
  • Multiple myeloma [R]
  • Waldenstrom’s macroglobulinemia (tumors that make large amounts of immunoglobulins) [R, R]
  • Atherosclerosis (plaque buildup in the arteries) and stroke [R]
  • Cancer risk, progression, and death [R, R, R]

Drugs and supplements:

  • Iodine, when it causes thyroid problems [R]
  • High ginger consumption, when it’s linked to subacute thyroiditis [R]
  • Birth control [R]
  • Smoking [R, R, R, R]
  • Alcohol [R, R]

  • Dextran [R]

Technical errors during the test such as a tilted tube or dilution error can also give a false high ESR result [R].

Factors That Decrease ESR Levels

When red blood cells are smaller, they will drop slower, hence a lower ESR.

  • Red blood cells diseases: extreme leukocytosis, polycythemia, microcytosis, sickle cell disease, spherocytosis, acanthocytosis, and anisocytosis [R, R, R, R, R]
  • Protein abnormalities: hypofibrinogenemia, hypogammaglobulinemia, and dysproteinemia with hyperviscosity state [R, R, R, R, R, R]
  • NSAIDs, cortisone, anesthetic drugs, levamisole, and prednisone [R, R, R, R, R].

What Happens If Your ESR Is High?

Conditions Associated With High ESR

1) Polymyalgia Rheumatica

Polymyalgia rheumatica is an inflammatory condition which affects people over 50. It causes pain and stiffness in the neck, shoulders, upper arms, and hips, or pain all over the body [R, R, R].

The ESR test is often used as a diagnostic tool for polymyalgia rheumatica, as high ESR levels show inflammation [R, R].

In multiple studies on 872 people with polymyalgia rheumatica, most people had ESR above 30 mm/h. Only 6% to 22% of them had ESR lower than 30 mm/h [R, R, R, R, R, R].  

High ESR (>30-40mm/h) may show polymyalgia rheumatica. Yet, normal ESR rates cannot exclude the condition and more tests should be done [R, R, R, R].

2) Giant Cell/Temporal Arteritis

Temporal arteritis or giant cell arteritis is when there is inflammation of the blood vessels. It affects people over 50 and is more common among women. It can cause headaches, pain in the joints, fever, eye pain, blindness, and even stroke. It is often related to polymyalgia rheumatica  [R, R, R, R, R].

One of the diagnostic criteria of temporal arteritis is when ESR is equal or higher than 50 mm/hr [R, R, R, R, R].

In multiple studies on 388 people with temporal arteritis, most people had ESR  above 40 mm/h [R, R, R, R, R, R].

High ESR (>40-50mm/h) can show temporal arteritis, but ESR < 40mm/h cannot exclude the condition. Other tests, like C-reactive protein, are more sensitive in diagnosing the disease [R, R].

3) Heart Disease

In multiple studies with over 262,652 people, people with high ESR had higher chances of developing heart failure, heart attack or atherosclerosis (hardening of the arteries) compared to people with normal ESR levels [R, R, R, R, R, R, R].

In multiple studies with over 20,933 people, people with high ESR had increased risk of dying from heart disease or stroke [R, R, R, R, R, R].           

In multiple studies with over 484 heart disease or stroke patients, most patients had increased ESR levels  [R, R, R].

In two studies on 983 patients who had heart surgery, people with ESR above 40 mm/h had longer periods of hospital stay and intensive unit care, and increased risk of adverse effects [R, R].

4) Cancer

In a study of 239,658 Swedish men, people with ESR above 15 mm/hr had a 63% higher risk of colorectal cancer compared to those with ESR of <10 mm/hr [R].

In a study on 5,500 people, those with weight loss, anemia, and high ESR have 50% chance of cancer.  Patients with weight loss and high ESR, have a 33% chance of cancer [R].

In a study of 4,452 people, breast cancer patients had much higher ESR levels (>35 mm/h) compared to healthy women and those with benign cancer [R].

In multiple studies with 1.2 million prostate cancer patients, patients with ESR above 50 mm/h had lower survival rates and a higher risk of metastasis [R, R, R].

In two studies with over 1,477 kidney cancer patients, high ESR increased the risk of death [R, R].

In 854 Hodgkin disease patients, patients with ESR above 30mm/h had active disease and a higher risk of death [R, R].

In 139 skin cancer patients, patients with ESR higher than 22mm/h had lower survival rates and a higher risk of metastasis [R].

In 97 patients with blood cancer (mycosis fungoides), patients with high ESR levels had 52.83% chance of surviving the disease [R].

In 220 patients with stomach cancer, men with ESR above 10mm/h and women with ESR above 20 mm/h had lower survival rates, more metastases and larger tumors [R].

In 410 patients with a type of bladder cancer (upper urinary tract urothelial carcinoma), ESR levels higher than 22mm/h for men and 27mm/h for women were related with cancer progression and death [R].

Patients with skin disease (dermatomyositis) and ESR levels higher than 35mm/h had higher chances of developing cancer [R].

In 94 patients with glioma (tumor in the brain or spinal cord), patients with ESR above 15 mm/h had higher chances of dying [R].

In 42 patients with multiple myeloma, patients with increased ESR had lower survival rates [R].

Patients with high ESR had lower chances of survival compared to patients with low ESR in a study on 189  lung cancer patients [R].

5) Rheumatoid Arthritis Progression

Rheumatoid arthritis (RA) is an autoimmune disease. It causes pain, stiffness, and swelling in joints. Increased ESR often suggests active RA or disease progression  [R, R, R, R].

In a 25-year study on 1,892 rheumatoid arthritis patients, the 64% of the patients had ESR levels higher than normal [R].

In multiple studies with 373 people with a 2-year study on 251 patients with rheumatoid arthritis, higher ESR levels showed worse disease status or lower treatment response [R, R, R].

But, in a 1-year study on 159 children with rheumatoid arthritis, the ESR levels did not relate with disease progression [R].

6) Bone Infections & Inflammations

ESR levels higher than 70 mm/hr in adults and above 12 mm/h in children can suggest bone infections [R, R, R, R].

People with diabetes and ESR above 70 mm/hr have increased the risk of developing a diabetic foot osteomyelitis (bone infection) [R].

In 61 patients with an untreated foot infection, ESR levels higher than 67 mm/hr indicated osteomyelitis (bone infection) [R].

In bone inflammation (spondylodiscitis), more than 90% of the patients have ESR levels between 43 mm/h and 87 mm/hr [R].

In 259 children with limb pain, ESR above 12 mm/hr and C-reactive protein (CRP) above 7 mg/L were related to orthopedic infection [R].

In patients after hip replacement surgery, increased ESR may show joint infection [R].

In 285 patients with knee osteoarthritis, patients with ESR above 20 mm/h had lower muscle strength compared to patients with normal ESR levels [R].

A decrease of ESR during treatment may show good treatment response and improvement in disease status [R, R]

7) Systemic Lupus Erythematosus (SLE)

Systemic lupus erythematosus (SLE) is an autoimmune condition. It can affect joints, the nervous system, the kidneys, the skin, the heart, and the lungs. People with lupus have periods of health (remission) and periods of illness (flares) [R, R, R].

In patients with active lupus, ESR is usually high. High ESR in lupus patients may indicate flares [R, R].

In multiple studies with over 1,032 people with lupus, abnormally high ESR showed flares, infections or disease progression [R, R, R, R].

8) Sickle-Cell Disease

In two studies with 139 children with sickle-cell disease, their normal ESR levels were below 8 mm/h. ESR above 20 mm/h showed crisis or infection [R, R].

If ESR is high (>20 mm/h) in people with sickle-cell disease, it indicates infection or painful crisis [R, R, R].

9) Ulcerative Colitis

In a 7-year study on 240,984 healthy men, people with higher than normal ESR levels had a higher risk of developing ulcerative colitis [R].

ESR above 15 mm/h may predict relapse in patients with ulcerative colitis [R].

10) Subacute Thyroiditis

Subacute thyroiditis is an inflammation of the thyroid. It causes pain and swelling of the thyroid, fever, and tiredness. In most patients with subacute thyroiditis, ESR levels are higher than 50 mm/h [R, R, R, R, R, R, R].

Ginger and iodine may cause subacute thyroiditis, which increases ESR [R, R].

11) Reduced Cognitive Ability

In 49,321 men, those with ESR above 7mm/h had decreased cognitive abilities at age 18-20 [R]

In 368 stroke patients, increased ESR were related to reduced hippocampal volume (part of the brain responsible for memory) and lower cognitive abilities [R].

Higher ESR was associated with a lower IQ in a study of 638k men [R].

12) Schizophrenia

Higher ESR was related to an increased risk for schizophrenia in a study of 638k men [R].

Causes of High ESR

1) High Fibrinogen

High fibrinogen levels make the red blood cells to clot together and fall faster, thus increasing ESR levels [R].

Diets high in iron, sugar, and caffeine were related to increased fibrinogen levels in 206 people [R].

Protein, in particular, may be necessary for healthy levels of fibrinogen. Protein-deficient animals have low fibrinogen compared to their properly-nourished counterparts [R].

In 16 people, a protein shake or a balanced-meal shake doubled fibrinogen levels [R].

2) High Triglycerides (Association)

In 101 people with high cholesterol and triglycerides, most of them had higher ESR levels [R].

  • A low-fat, high-carbohydrate diet increased blood triglycerides in healthy adults [R, R, R, R].
  • Low-fat, high-carbohydrate, sugar-rich diets increase the production of  Very-Low-Density Lipoprotein (VLDL), and blood triglycerides [R, R, R].
  • Lack of exercise and sugar consumption, including fructose and glucose, can increase blood triglyceride levels [R, R, R].

3) Birth Control

In 42 healthy women who were taking oral contraceptives, 45% of them had much higher than normal ESR levels [R].

4) Alcohol Consumption

Chronic alcohol consumption can cause inflammation [R].

In a study on 250 people, people with alcoholic fatty liver disease and alcoholics had the highest ESR levels compared to the other groups [R].

Alcohol can also cause macrocytosis (large red blood cells), a condition which increases ESR [R, R, R].

5) Smoking

Smoking produces free radicals which increase inflammatory proteins, such as fibrinogen. This leads to increased ESR levels [R, R].

In 550 arthritis patients, smokers had higher ESR levels and lower immunoglobulin levels, independent of their treatment or condition [R].  

In 105 healthy men, smokers had higher ESR compared to non-smokers, but the number of cigarettes did not play any role in ESR [R].

6) Immunoglobins (IVIG)

High dose of immunoglobulin injections (IVIG) increased the ESR levels in 63 children with Kawasaki disease on a 7-day study [R].

In another 7-day study on 21 patients with an autoimmune disease, a high dose of immunoglobulin injections (IVIG) increased their ESR levels [R].

Potential Benefits of High ESR

1) High ESR Levels May Increase Survival In Heart Failure

In a study of 242 people with chronic heart failure, those with high ESR levels had higher survival rates compared to patients with low or normal ESR levels [R].

2) High ESR Levels May Increase Survival In Cancer

In a study on 300 people with prostate cancer, ESR levels between 40-50 mm/hr were associated with a lower risk of death [R].

Diseases Associated With Low ESR

1) Sickle-Cell Anemia

Sickle-cell anemia is a genetic blood disorder. People with sickle-cell anemia have abnormal hemoglobin (sickle hemoglobin),  making their red blood cells crescent shaped. These cells block blood flow in the vessels and die faster than normal red blood cells, which causes low hematocrit levels [R, R, R].

The deformed sickle cells fall down more slowly. Hence, people with sickle-cell anemia usually have low ESR levels (< 5 mm/hr) [R, R, R, R].

In 44 children with sickle-cell disease, their average ESR levels were 7.9 mm/hr when they were healthy [R].

2) Red Blood Cells Abnormalities

Red blood cells that have different shapes or sizes decrease the sedimentation (falling) rate. These conditions include [R, R, R, R]:

  • Spherocytosis (red blood cells are shaped like circles)
  • Polycythemia (increased production of red blood cells)
  • Acanthocytosis (red blood cells with spikes)
  • Anisocytosis (red blood cells of unequal size)
  • Microcytosis (very small red blood cells)

3) Extreme Leukocytosis

Leukocytosis is the condition which the body produces a high amount of white blood cells, which decreases the ESR [R, R, R, R, R].

4) High Fibrinogen

High fibrinogen levels make the red blood cells clot together and fall faster, which increases ESR levels [R].

In hypofibrinogenemia, the body produces less fibrinogen than normal, which decreases ESR [R, R, R, R].

Benefits of Low ESR

Low ESR Levels May Predict Cancer Survival

In a study on 220 people with stomach cancer, men with ESR lower than 10mm/hr and women with ESR lower than 20 mm/hr had higher survival rates [R].

Ways to Decrease ESR

Living a healthy and hygienic lifestyle can help protect the body against infections. People with infections can have a high sedimentation rate. Thus, preventing infections can help prevent increases in ESR [R, R].

1) Exercise Decreases ESR

Exercise can decrease inflammation [R, R, R].

In two studies with over 1,054 people, light or moderate exercise decreased their ESR levels [R, R].

In an animal study, ESR decreased more when the training intensity increased [R].

2) Diet and Nutrition Can Help Decrease ESR

In a randomized study on 27 people, a gluten-free vegan diet and a lacto-vegetarian diet decreased their ESR levels [R].

In a study on 23 people, a 7-day fast reduced ESR levels [R].

Fish oil decreased the ESR levels in 2 randomized trials with 60 people [R, R].

Vitamin A and vitamin E decreased ESR levels in rats [R].

3) Weight loss Decreases ESR

Losing weight can help decrease ESR [R].

4) Supplements May Help Decrease ESR:

  • Vitamin C [R]
  • Boswellia serrata [R]
  • Resveratrol [R]
  • Goji berry [R]
  • Curcumin [R]
  • Fish oil/omega-3 fatty acids [R, R]
  • Green and black tea [R, R]
  • Goji berry [R]

5) Dental Hygiene

In 32 patients with gum disease, periodontal treatment decreased ESR levels after 2 months [R].

6) Drugs

In 64 patients who had surgery, their ESR levels decreased after they received propofol and thiopental (anesthetic drugs) [R].

In 2 meta-analysis studies, statin therapy decreased ESR levels in patients with rheumatoid arthritis [R, R].

Drugs which fight inflammation and infection may also decrease ESR levels. These include

  • Tocilizumab [R, R]
  • Levamisole [R]
  • NSAIDs (non-steroidal anti-inflammatory drugs) [R, R]
  • Cortisone [R, R]

Genetics of ESR

Genes That Affect ESR

These SNPs/genes are associated with a higher ESR:

  • rs3750996 (G/G) [R], rs3750996 (G-C) [R]
  • rs2066865 (C>T) (minor allele) [R]
  • rs3750994 (G-C) is related to higher ESR levels [R].

High fibrinogen levels make the red blood cells heavier and increase the ESR. So, genes increasing fibrinogen production could theoretically increase ESR levels. These include:

These SNPs/genes are associated with lower ESR levels:

  • rs630337 (T/C) [R].
  • rs11117956 (T/G) [R]
  • rs11549407 (A/G) [R]
  • rs650877 (G/A) [R]
  • rs11118131 (T/C) [R]
  • rs677066 (G/A) [R]
  • rs6691117 (G/A)  [R]
  • rs12034383 (G/A)[R]
  • rs1043879 [R]
  • rs3091242 [R]
  • rs873308 [R]
  • rs10903129 [R]
  • rs7527798 [R]

Low fibrinogen levels make the red blood cells lighter and decrease the ESR. So, genes decreasing fibrinogen production may  theoretically reduce ESR levels:

  • rs1800787 (C>T) is associated with low fibrinogen, slow initiation of the coagulation cascade, and possibly childhood pneumonia [R, R, R]
  • rs148685782 (G>C) is associated with low blood fibrinogen levels and hypofibrinogenemia [R, R]


ESR and C-Reactive Protein (CRP)

In inflammation, the liver is producing a protein called C-reactive protein (CRP). The CRP blood test checks whether you have inflammation or infection. CRP levels higher than 10 mg/dL show infection [R, R, R].

CRP test is used most times together with the ESR test [R, R, R].

C-reactive protein is more sensitive than ESR and produces less false negative/false positive results than ESR [R].

CRP is better for checking and tracking the progress of acute inflammations, and infections [R, R, R].

ESR is better for checking and tracking the progress of chronic inflammations, and infections [R, R, R].

Limitations and Caveats

While there are many studies examining ESR, almost all of them are population-based and/or based on older data. Also, many of the studies were only conducted with men.

More clinical trials investigating ESR should be undertaken.

Abnormal ESR?

When people go to their doctor to get their ESR tested, almost always, the results are not scrutinized, even though we know that you can be healthier and live longer when your results lie within optimal ranges. When I used to go to doctors and tried to discuss my results, they had no clue what these meant from a health perspective. All they cared about was whether they could diagnose me with some disease. This is why we created Lab Test Analyzer, a tool that easily lets you know which lab results you need to be concerned about, and how to bring these within the optimal range.

FDA Compliance

The information on this website has not been evaluated by the Food & Drug Administration or any other medical body. We do not aim to diagnose, treat, cure or prevent any illness or disease. Information is shared for educational purposes only. You must consult your doctor before acting on any content on this website, especially if you are pregnant, nursing, taking medication, or have a medical condition.


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