Lab test

ESR Test - Erythrocyte Sedimentation Rate Test

An erythrocyte sedimentation rate (ESR) test measures how quickly red blood cells settle in a tube over a period of time.

Typical price

From $49

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

An erythrocyte sedimentation rate (ESR) test measures how quickly red blood cells settle in a tube over a period of time. A faster rate can accompany inflammation somewhere in the body, making ESR a general marker rather than a specific one. Clinicians order it to help detect conditions associated with inflammation, such as certain infections, autoimmune conditions, and arthritis, and to monitor known inflammatory disease.

• Erythrocyte sedimentation rate (ESR) The rate at which red blood cells settle, which can rise with inflammation.

• People with joint pain, stiffness, or swelling.
• Individuals with unexplained fever or fatigue.
• Those being evaluated for autoimmune or inflammatory conditions.
• People monitored for a known inflammatory disease.
• Anyone whose provider suspects hidden inflammation.

• No fasting is required for an ESR test.
• Take usual medications unless told otherwise.
• Tell the provider about recent illness or inflammation.
• A standard blood draw is used for the sample.
• Share any conditions that can affect red blood cells.

A higher ESR can be associated with inflammation from many causes, including infection, autoimmune conditions, and arthritis, while a normal ESR is generally reassuring. Because ESR is nonspecific, it is interpreted with symptoms, other markers such as CRP, and additional testing. A single value does not identify the source of inflammation. Discuss your result with a healthcare provider.

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