Functional specification:
ESR tubes are used for blood collection and anticoagulation for sedimentation rate test. The tubes contain a 3.8 % buffered tri-sodium citrate solution (0.129mol/l) with the mixing ratio of 1 part citrate solution to 4 parts blood. They are available in glass, a range of sizes and can be identified by a black cap.
Technical specification:
| Material | Spec（mm） | Volume（ml） | Label | Package |
| Glass | 13*75 | 2 | Paper label/UV Printing | 100/1800 |
