Erythrocyte Sedimentation Rate (ESR)

ESR Blood Test | Inflammation Marker | London Blood Tests

Measure inflammation with our ESR blood test for £55. UKAS-accredited testing, fast results, and optional GP consultation available.

The Erythrocyte Sedimentation Rate (ESR) Test is a simple blood test used to detect inflammation in the body. It helps identify inflammatory, autoimmune, or infectious conditions and monitor disease activity. Testing is performed in a UKAS-accredited laboratory, with fast results and an optional GP consultation.

What is an ESR Blood Test?

The Erythrocyte Sedimentation Rate (ESR) measures how quickly red blood cells settle at the bottom of a test tube over one hour. When inflammation is present, proteins in the blood cause red cells to clump together and sink faster, resulting in a higher ESR value.

ESR does not diagnose a specific condition, but it is a valuable marker for detecting and monitoring systemic inflammation. It is commonly used alongside other tests such as CRP, full blood count, and autoimmune markers to build a clearer clinical picture.

Because ESR reflects ongoing inflammatory activity, it is particularly useful for monitoring chronic inflammatory or autoimmune diseases over time rather than detecting acute infection alone.

Benefits of the ESR Test

1. Detects General Inflammation
   Identifies whether inflammation is present anywhere in the body.

2. Supports Autoimmune Disease Monitoring
   Commonly used to monitor conditions such as rheumatoid arthritis, lupus, and vasculitis.

3. Assists in Infection Investigation
   Helps differentiate inflammatory or infectious causes of unexplained symptoms.

4. Monitors Disease Activity Over Time
   Rising or falling ESR values can reflect worsening or improving inflammation.

5. Simple and Cost-Effective
   A low-cost blood test requiring minimal preparation.

6. Complements Other Inflammatory Markers
   Often used alongside CRP to distinguish acute vs chronic inflammation.

7. Optional GP Consultation for Interpretation
   Results can be reviewed with a GP to determine next steps or further testing.

Why Do I Need an ESR Blood Test?

You may benefit from an ESR test if you experience symptoms that suggest inflammation, including:

• Persistent fatigue or malaise

• Joint pain, stiffness, or swelling

• Muscle aches

• Fever of unknown origin

• Unexplained weight loss

• Chronic headaches or visual disturbances

• Suspected autoimmune or inflammatory disease

ESR testing is also useful for:

• Monitoring known autoimmune or inflammatory conditions

• Assessing response to treatment

• Investigating unexplained symptoms when initial tests are inconclusive

How the Test Works

In-Clinic Testing at London Blood Tests

1. Book Your Appointment

   • Book online or by phone at your preferred clinic.

   • No fasting required.

2. Pre-Test Review

   • Inform the clinician about any current infections or medications.

3. Sample Collection

   • A trained phlebotomist collects a small venous blood sample.

   • The process takes 5–10 minutes.

4. Laboratory Analysis

   • The sample is analysed in a UKAS-accredited laboratory using standard ESR methodology.

5. Quality Control

   • Results undergo internal verification before release.

6. Results Delivery

   • Results are typically available within 1–2 business days.

7. Optional GP Consultation

   • Discuss your results and next steps with a GP if required.

At-Home Blood Draw (Home or Hotel Phlebotomy – UK-Wide)

1. Book Your Visit

   • Arrange a phlebotomist home or hotel visit at a convenient time.

2. Professional Collection

   • A certified phlebotomist collects your blood sample.

3. Secure Transport

   • Sample is couriered the same day to the laboratory.

4. Laboratory Testing

   • Analysis identical to in-clinic testing.

5. Results & Follow-Up

   • Results delivered online within 1–2 business days, GP review optional.

Your ESR Test Results – Explained

ESR is reported in millimetres per hour (mm/hr).

Typical adult reference ranges:

• Men: < 15 mm/hr

• Women: < 20 mm/hr

• Older adults: slightly higher values may be normal

Interpretation:

• Normal ESR: little or no systemic inflammation

• Mildly elevated: possible low-grade or chronic inflammation

• Markedly elevated: active inflammation, infection, or autoimmune disease

ESR results should always be interpreted alongside symptoms and other blood tests, as many conditions can influence the result.