Which statement is true about the Westergren tube in comparison to the Wintrobe tube?

The statement "The Westergren tube is longer than the Wintrobe tube" is true because the Westergren tube is specifically designed for erythrocyte sedimentation rate (ESR) testing and is typically 300 mm in length. In contrast, the Wintrobe tube is usually about 75 mm long. The increased length of the Westergren tube allows for more precise measurement of the sedimentation rate over a greater distance, which is important for accurately assessing the cumulative sedimentation of red blood cells in relation to time.

Additionally, the Westergren tube often has a larger bore diameter than the Wintrobe tube, which helps in achieving better motion of the blood during sedimentation. This design contributes to the accuracy and reliability of the test results, making the Westergren method preferred for ESR determination in clinical practice. Understanding the differences between these two tubes is critical for laboratory professionals when selecting appropriate methods for testing.