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Usage:- esr tube is used for erythrocytes sedimentation rate test as per westergren method. 400ul nac 3.8% added in to the tube.mixing ratio 1:4 product name : sodium citrated tubes( nac 3.8%) product code : sld-nac cap colour : black volume : 1.6ml(2ml) pack : 100nos pack box : 20 x 100 = 2000 pack