3.8% Sodium Citrate ESR Tubes with Black Stopper: Dedicated Collection for Westergren & Automated Methods

Customized  Medical Vacuum Blood Collection Tube

Vacuum Blood Collection 

One Tube, One Test, One Standard: Dedicated to Accurate ESR
The Erythrocyte Sedimentation Rate (ESR) is one of the oldest and most enduring laboratory tests—a simple, non‑specific marker of inflammation that remains invaluable in diagnosing and monitoring conditions ranging from autoimmune disorders to infections and malignancies. Its apparent simplicity, however, belies a critical requirement: absolute standardization at the point of collection. Any deviation in the blood‑to‑anticoagulant ratio or tube dimensions directly alters the sedimentation rate, potentially misleading clinicians.

Our Black Top ESR Vacuum Tubes are engineered for this single, essential purpose. Pre‑filled with exactly 3.8% (0.129M) tri‑sodium citrate and calibrated to draw the precise blood volume required for a 4:1 ratio (4 parts blood : 1 part citrate) , these tubes eliminate the most common pre‑analytical errors in ESR testing. The standardized black stopper provides immediate visual identification, distinguishing them from coagulation (light blue) and other citrate tubes.