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ESR blood test

What the ESR Blood Test Reveals About Your Health and Inflammation

The Erythrocyte Sedimentation Rate (ESR) blood test is a vital tool in diagnosing conditions associated with inflammation, such as infections and autoimmune disorders. This test measures how quickly red blood cells settle in a test tube, with higher rates indicating potential inflammation.


At One Day Tests, we understand the importance of timely and accurate results in managing your health. As a leading diagnostic provider, we are committed to delivering fast, reliable testing services, ensuring that you have the information you need to make informed health decisions.

Blood test results

What is ESR?

The Erythrocyte Sedimentation Rate (ESR), also known as the sedimentation rate, sed rate, or ESR for short, is a commonly performed haematology test used to detect and monitor inflammation in the body. This test measures how quickly red blood cells settle at the bottom of a test tube over a set period. When inflammation is present, proteins in the blood cause red blood cells to clump together and settle more rapidly, leading to a higher ESR.


ESR is not specific to any single disease but serves as a general indicator of inflammation. It is often used alongside other tests to help diagnose conditions such as autoimmune diseases, infections, or tumours. Due to its simplicity, reproducibility, and low cost, the ESR has been a staple in clinical settings for decades, often referred to as a "sickness indicator."

Normal Results of ESR

The normal ESR levels vary based on age and sex:

  • Men under 50 years old: less than 15 mm/hr
  • Men over 50 years old: less than 20 mm/hr
  • Women under 50 years old: less than 20 mm/hr
  • Women over 50 years old: less than 30 mm/hr


An ESR higher than these ranges can indicate the presence of inflammation due to various causes, such as infections, autoimmune diseases, or cancers.


What Does a High ESR Mean?


A high Erythrocyte Sedimentation Rate (ESR) indicates that there may be inflammation in the body. This can be due to various causes, such as infections, autoimmune diseases like lupus and rheumatoid arthritis, or certain cancers.


However, ESR is a nonspecific marker, meaning it does not point to a specific disease but rather suggests that an inflammatory process might be occurring. The level of elevation can provide some insight into the severity of the inflammation, but further tests are often required to identify the underlying cause.

Inflammation in arm

What Infections Can Cause High ESR?

As mentioned, an ESR test cannot diagnose one specific condition but it can help determine whether you’re experiencing inflammation and what further testing may be needed. The ESR blood test can also monitor existing diseases you already have.


Common examples include:

  • Bacterial Infections: These are the most common causes of a high ESR. Infections like tuberculosis, pneumonia, and bacterial endocarditis typically lead to significant inflammation, which raises ESR levels.

  • Tuberculosis: This chronic bacterial infection of the lungs and other organs is known for causing very high ESR levels due to the extensive inflammation it induces.

  • Abscesses and Chronic Infections: Localised infections, such as abscesses, or chronic infections, like osteomyelitis, can also lead to elevated ESR levels.

Bacterial vs. Viral Infections


While both bacterial and viral infections can increase ESR, bacterial infections generally cause a more pronounced rise. Viral infections may result in a mild to moderate elevation, but typically less so than bacterial infections.


Why is ESR Higher in Females?


ESR levels tend to be higher in females due to a variety of physiological factors. One of the primary reasons is hormonal differences, particularly the influence of oestrogen, which can affect the rate at which red blood cells settle.


Additionally, women are more likely to experience conditions like anaemia, particularly during menstruation or pregnancy, which can further elevate ESR levels. Anaemia decreases the concentration of red blood cells, leading to faster sedimentation and a higher ESR.

Man taking blood test

Why is ESR Testing Important?

The ESR test is an important tool for detecting and monitoring inflammation in the body. While it is a non-specific test, meaning it does not diagnose a particular condition, it plays a crucial role in identifying the presence of inflammatory processes.


ESR tests are valuable for tracking the progression of diseases such as autoimmune disorders, infections, and cancers. Regular monitoring of ESR levels can help healthcare providers assess the effectiveness of treatment plans and adjust them accordingly, ensuring better patient outcomes.

Our ESR Blood Test

Take Control of Your Health with One Day Tests' ESR Blood Test

Inflammation can be a sign of underlying health issues, and understanding it starts with accurate testing. The ESR Blood Test from One Day Tests provides essential insights into your body's inflammatory activity, helping you stay informed about your health.


Whether you choose our convenient home test kits or visit our clinics, you’ll receive quick and reliable results. Don’t let inflammation go unchecked - take a proactive approach to your health. Visit One Day Tests to order your ESR Blood Test today and gain valuable information for better health management.

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