The color of the tube used for erythrocyte sedimentation rate (ESR) testing is typically black, containing sodium citrate as an anticoagulant. This specific additive maintains a ratio of one part citrate to four parts blood, crucial for accurate results. Other blood tests may utilize differently colored tubes with varying anticoagulants, each suited to specific analyses.
Correct tube selection is essential for reliable ESR results. Using an incorrect additive or ratio can alter the sedimentation process, leading to misleading clinical interpretations. The standardized black-topped tube ensures consistency and comparability across different laboratories and time points, supporting accurate disease monitoring and diagnosis. Historically, Westergren and Wintrobe methods have been employed, with standardized methods improving result accuracy and reliability over time.
