What Tube Does ESR Go In? A Practical Guide for Accurate Results

The erythrocyte sedimentation rate (ESR) is a simple, inexpensive blood test that helps clinicians assess inflammation, infection, and other medical conditions. Although the test itself is straightforward, the accuracy of the result hinges on proper specimen collection. A common question among healthcare professionals and students is: “What tube does ESR go in?” This article explains the recommended tube types, key collection steps, and practical tips to ensure reliable ESR measurements.

Understanding the ESR Test

ESR measures the rate at which red blood cells (erythrocytes) settle in a vertical tube over a specified time period, typically one hour. The test reflects how quickly cells aggregate, which is influenced by plasma proteins such as fibrinogen and immunoglobulins