Model Number: ESR Brand Name: OEM Key Specifications/Special Features: The tubes are specially used for determination of the erythrocyte sedimentation rate (ESR) by the Westergren’s MethodThe mixing ratio is 1 part citrate solution to 4 parts bloodESR measurements refer to the Westergren methodColor code: blackSpecifications: 13x75mm 8x120mmType of additive: 3.8% sodium citrateMaximum vacuum tolerance: ≤5%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 fully2. Sampling the blood dosage as required to ensuring the test accuracy