Attentions: During the operation, do pay attentions to the followings:
1. As soon as the sampling, upside down the tube by 180°shaking and fixing fully.
2. Sampling the blood dosage as required to ensuring the test accuracy.
The tubes are specially used for determination of the erythrocyte sedimentation rate (ESR) by the Westergren's Method. The mixing ratio is 1 part citrate solution to 4 parts blood. ESR measurements refer to the Westergren method.